Add gating tests (copied from podman)

Add gating tests, rawhide only. These are an almost-verbatim
copy of podman's gating tests - as of this writing there is
no way for CI tests to say "run another package's tests".
Miro is aware of the need for this, and says the feature
may be available "sooner or later" [conversation in #osci]

Signed-off-by: Ed Santiago <santiago@redhat.com>

gating.yaml

@@ -0,0 +1,6 @@
+--- !Policy
+product_versions:
+  - fedora-*
+decision_context: bodhi_update_push_stable
+rules:
+  - !PassingTestCaseRule {test_case_name: org.centos.prod.ci.pipeline.allpackages-build.complete}