gather_job_data: detect specific before generic

[NickVolynkin]

Detect specific failure reasons first. If none found in the whole log,
look for generic. This way, specific reasons aren't overshadowed by
generic ones, when those are found first in the logs.

Introduce one specific reason: "Address already in use", subject of
tarantool/test-run#141

test name	before	after
total	47	47
testrun_address_already_in_use	0	19
testrun_test_failed	11	4
dpkg_buildpackage_error	9	0
unknown	8	8
integration_vshard_test_failed	4	3
testrun_test_hung 3	3	3
dir_not_empty 3	3	3
testrun_internal	2	2
integration_tests_failed	2	2
jepsen_error	2	2
luajit_error	1	1
git_repo_access_error	1	1