Apply pylint to scripts/manifest_check*.py

1. Run pyformat scripts/<script>.py -s 4 --force_quote_type
none -i to fix formatting
2. Annotate #pylint: disable, where straightforward fix is not available

Test: m manifest_check_test
Test: pylint --rcfile tools/repohooks/tools/pylintrc
build/soong/scripts/manifest_check.py
build/soong/scripts/manifest_check_test.py
Bug: 195738175

Change-Id: I9af498c4abd6ac9f8b9df4f93cbdd4424eacff8e