Add rpminspect.yaml to avoid warnings about xml files from tests

rpminspect.yaml

@@ -0,0 +1,7 @@
+---
+inspections:
+  # Since there won't be any other Qt updates (except backports) and not-valid
+  # xml files are only in the tests, we can completely skip this test instead of
+  # specifying all the files that should be ignored.
+  xml: off
+