Skip running jobs on ironic and inspector unit tests

Bifrost jobs run on ironic and ironic-inspector as well, we need to skip
integration jobs if only unit tests are modified.

Change-Id: I7796f0b4d702b8347f3dadb4f3c907b8b499a819

zuul.d/bifrost-jobs.yaml

@@ -3,9 +3,13 @@
     parent: base
     irrelevant-files:
       - ^.*\.rst$
-      - ^bifrost/tests/.*$
       - ^api-ref/.*$
+      - ^bifrost/tests/.*$
       - ^doc/.*$
+      - ^ironic/locale/.*$
+      - ^ironic/tests/.*$
+      - ^ironic_inspector/locale/.*$
+      - ^ironic_inspector/test/.*$
       - ^releasenotes/.*$
       - ^setup.cfg$
       - ^test-requirements.txt$