Omit ngclient from coverage check

Restore coverage back to 97% but omit ngclient
form the overall score until tests are implemented.

Signed-off-by: Teodora Sechkova <[email protected]>

Author: sechkova

tox.ini

@@ -16,7 +16,7 @@ changedir = tests
 commands =
     python --version
     python -m coverage run aggregate_tests.py
-    python -m coverage report -m --fail-under 90
+    python -m coverage report -m --fail-under 97 --omit "{toxinidir}/tuf/ngclient/*"
 
 deps =
     -r{toxinidir}/requirements-test.txt