tools/check_patch.py: Update ignore pattern

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Updating ignored errors

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
propcan_unittest.py: Ignore pylint false negative

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>