Add irrelevant files to .zuul.yaml

This commit adds 4 irrelevant files to both "irrelevant-files" and
"irrelevant-files-2". We don't need to run tempest tests with updating
such files because they don't affect tempest tests.

Change-Id: I6f84abc1b9273f38b99678edaff54deb0fd99e0c
1 file changed