gha: enable hdfs tests

[efiop]

Part of #4418

• ❗ I have followed the Contributing to DVC checklist.

• 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

Thank you for the contribution - we'll try to review it as soon as possible. 🙏

[efiop]

For some reason, python's tarfile sometimes throws this error. In the interest of time leaving with os.system for now.

2020-09-30T02:02:05.7905854Z ______________________ ERROR at setup of test_cloud[hdfs] ______________________
2020-09-30T02:02:05.7907160Z [gw3] linux -- Python 3.7.9 /opt/hostedtoolcache/Python/3.7.9/x64/bin/python
2020-09-30T02:02:05.7907751Z 
2020-09-30T02:02:05.7908331Z request = <FixtureRequest for <Function test_cloud[hdfs]>>
2020-09-30T02:02:05.7908849Z 
2020-09-30T02:02:05.7909303Z     def fill(request):
2020-09-30T02:02:05.7909825Z         item = request._pyfuncitem
2020-09-30T02:02:05.7910472Z         fixturenames = getattr(item, "fixturenames", None)
2020-09-30T02:02:05.7911296Z         if fixturenames is None:
2020-09-30T02:02:05.7911980Z             fixturenames = request.fixturenames
2020-09-30T02:02:05.7912585Z     
2020-09-30T02:02:05.7913303Z         if hasattr(item, 'callspec'):
2020-09-30T02:02:05.7914167Z             for param, val in sorted_by_dependency(item.callspec.params, fixturenames):
2020-09-30T02:02:05.7915106Z                 if val is not None and is_lazy_fixture(val):
2020-09-30T02:02:05.7916179Z >                   item.callspec.params[param] = request.getfixturevalue(val.name)
2020-09-30T02:02:05.7916883Z 
2020-09-30T02:02:05.7917832Z /opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/site-packages/pytest_lazyfixture.py:35: 
2020-09-30T02:02:05.7918778Z _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
2020-09-30T02:02:05.7919522Z /home/runner/work/dvc/dvc/tests/remotes/hdfs.py:109: in hadoop
2020-09-30T02:02:05.7920194Z     _get(java_url, java_tar, java_home)
2020-09-30T02:02:05.7920848Z /home/runner/work/dvc/dvc/tests/remotes/hdfs.py:104: in _get
2020-09-30T02:02:05.7921514Z     tar.extractall(dname)
2020-09-30T02:02:05.7922286Z /opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/tarfile.py:2002: in extractall
2020-09-30T02:02:05.7923064Z     numeric_owner=numeric_owner)
2020-09-30T02:02:05.7923816Z /opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/tarfile.py:2044: in extract
2020-09-30T02:02:05.7924573Z     numeric_owner=numeric_owner)
2020-09-30T02:02:05.7925358Z /opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/tarfile.py:2114: in _extract_member
2020-09-30T02:02:05.7926211Z     self.makefile(tarinfo, targetpath)
2020-09-30T02:02:05.7926795Z _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
2020-09-30T02:02:05.7927823Z 
2020-09-30T02:02:05.7928403Z self = <tarfile.TarFile object at 0x7f29e8d0e4d0>
2020-09-30T02:02:05.7929393Z tarinfo = <TarInfo 'java-se-7u75-ri/LICENSE' at 0x7f29e8d8c390>
2020-09-30T02:02:05.7930509Z targetpath = '/home/runner/.cache/dvc-test/hdfs/java-se-7u75-ri/LICENSE'
2020-09-30T02:02:05.7931014Z 
2020-09-30T02:02:05.7931448Z     def makefile(self, tarinfo, targetpath):
2020-09-30T02:02:05.7931992Z         """Make a file called targetpath.
2020-09-30T02:02:05.7932402Z         """
2020-09-30T02:02:05.7932790Z         source = self.fileobj
2020-09-30T02:02:05.7933326Z         source.seek(tarinfo.offset_data)
2020-09-30T02:02:05.7933875Z         bufsize = self.copybufsize
2020-09-30T02:02:05.7934411Z >       with bltn_open(targetpath, "wb") as target:
2020-09-30T02:02:05.7935447Z E       PermissionError: [Errno 13] Permission denied: '/home/runner/.cache/dvc-test/hdfs/java-se-7u75-ri/LICENSE'
2020-09-30T02:02:05.7936247Z 
2020-09-30T02:02:05.7936921Z /opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/tarfile.py:2155: PermissionError
2020-09-30T02:02:05.7937568Z ____________________ ERROR at setup of test_cloud_cli[hdfs] ____________________
2020-09-30T02:02:05.7938791Z [gw3] linux -- Python 3.7.9 /opt/hostedtoolcache/Python/3.7.9/x64/bin/python
2020-09-30T02:02:05.7939143Z 
2020-09-30T02:02:05.7939546Z request = <FixtureRequest for <Function test_cloud_cli[hdfs]>>
2020-09-30T02:02:05.7939897Z 
2020-09-30T02:02:05.7940137Z     def fill(request):
2020-09-30T02:02:05.7940477Z         item = request._pyfuncitem
2020-09-30T02:02:05.7940946Z         fixturenames = getattr(item, "fixturenames", None)
2020-09-30T02:02:05.7941409Z         if fixturenames is None:
2020-09-30T02:02:05.7942113Z             fixturenames = request.fixturenames
2020-09-30T02:02:05.7942501Z     
2020-09-30T02:02:05.7942962Z         if hasattr(item, 'callspec'):
2020-09-30T02:02:05.7943552Z             for param, val in sorted_by_dependency(item.callspec.params, fixturenames):
2020-09-30T02:02:05.7944181Z                 if val is not None and is_lazy_fixture(val):
2020-09-30T02:02:05.7944833Z >                   item.callspec.params[param] = request.getfixturevalue(val.name)
2020-09-30T02:02:05.7945336Z 
2020-09-30T02:02:05.7946061Z /opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/site-packages/pytest_lazyfixture.py:35: 
2020-09-30T02:02:05.7946614Z _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
2020-09-30T02:02:05.7946985Z /home/runner/work/dvc/dvc/tests/remotes/hdfs.py:109: in hadoop
2020-09-30T02:02:05.7947429Z     _get(java_url, java_tar, java_home)
2020-09-30T02:02:05.7947858Z /home/runner/work/dvc/dvc/tests/remotes/hdfs.py:104: in _get
2020-09-30T02:02:05.7948287Z     tar.extractall(dname)
2020-09-30T02:02:05.7949013Z /opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/tarfile.py:2002: in extractall
2020-09-30T02:02:05.7949568Z     numeric_owner=numeric_owner)
2020-09-30T02:02:05.7950091Z /opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/tarfile.py:2044: in extract
2020-09-30T02:02:05.7950614Z     numeric_owner=numeric_owner)
2020-09-30T02:02:05.7951240Z /opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/tarfile.py:2114: in _extract_member
2020-09-30T02:02:05.7951830Z     self.makefile(tarinfo, targetpath)
2020-09-30T02:02:05.7952193Z _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
2020-09-30T02:02:05.7952382Z 
2020-09-30T02:02:05.7952739Z self = <tarfile.TarFile object at 0x7f29e8d0e4d0>
2020-09-30T02:02:05.7953487Z tarinfo = <TarInfo 'java-se-7u75-ri/LICENSE' at 0x7f29e8d8c390>
2020-09-30T02:02:05.7954259Z targetpath = '/home/runner/.cache/dvc-test/hdfs/java-se-7u75-ri/LICENSE'
2020-09-30T02:02:05.7954650Z 
2020-09-30T02:02:05.7954988Z     def makefile(self, tarinfo, targetpath):
2020-09-30T02:02:05.7955428Z         """Make a file called targetpath.
2020-09-30T02:02:05.7955727Z         """
2020-09-30T02:02:05.7955993Z         source = self.fileobj
2020-09-30T02:02:05.7956404Z         source.seek(tarinfo.offset_data)
2020-09-30T02:02:05.7956847Z         bufsize = self.copybufsize
2020-09-30T02:02:05.7957274Z >       with bltn_open(targetpath, "wb") as target:
2020-09-30T02:02:05.7958179Z E       PermissionError: [Errno 13] Permission denied: '/home/runner/.cache/dvc-test/hdfs/java-se-7u75-ri/LICENSE'
2020-09-30T02:02:05.7958693Z 
2020-09-30T02:02:05.7959187Z /opt/hostedtoolcache/Python/3.7.9/x64/lib/python3.7/tarfile.py:2155: PermissionError
2020-09-30T02:02:05.7959635Z 
2020-09-30T02:02:05.7960149Z ----------- coverage: platform linux, python 3.7.9-final-0 -----------
2020-09-30T02:02:05.7960623Z Coverage XML written to file coverage.xml
2020-09-30T02:02:05.7960898Z 
2020-09-30T02:02:05.7961144Z ===Flaky Test Report===
2020-09-30T02:02:05.7961334Z 
2020-09-30T02:02:05.7961745Z test_pull_git_imports[erepo_dir] passed 1 out of the required 1 times. Success!
2020-09-30T02:02:05.7962346Z test_pull_git_imports[git_dir] passed 1 out of the required 1 times. Success!
2020-09-30T02:02:05.7962701Z 
2020-09-30T02:02:05.7962943Z ===End Flaky Test Report===
2020-09-30T02:02:05.7963285Z ============================== slowest durations ===============================
2020-09-30T02:02:05.7964844Z 114.47s setup    tests/func/test_add.py::test_add_external_file[hdfs-checksum-000002000000000000000000a86fe4d846edc1bf4c355cb6112f141e]
2020-09-30T02:02:05.7965963Z 107.88s setup    tests/func/test_api.py::test_get_url[hdfs]
2020-09-30T02:02:05.7966406Z 94.24s setup    tests/func/test_api.py::test_get_url[oss]
2020-09-30T02:02:05.7966879Z 84.56s setup    tests/func/test_api.py::test_open_granular[azure]
2020-09-30T02:02:05.7967403Z 25.33s call     tests/func/test_update.py::test_update_import_url[hdfs]
2020-09-30T02:02:05.7969991Z 21.79s call     tests/func/test_run_multistage.py::test_run_external_outputs[hdfs-checksum-0000020000000000000000003dba826b9be9c6a8e2f8310a770555c4-00000200000000000000000075433c81259d3c38e364b348af52e84d]
2020-09-30T02:02:05.7974006Z 20.01s call     tests/func/test_add.py::test_add_external_file[hdfs-checksum-