Add unit tests to for {runtime,priority}ClassName

These unit tests go over all the possible pods using the
mount feature and make sure they are all listed in the
runtime and priority class, which will make sure we don't
miss any.

Skip-Release-Notes
Change-Id: Iba2e24bebd70f0d99f44566a1b0f115e4faa8f5b
diff --git a/roles/heat/vars_test.go b/roles/heat/vars_test.go
index a87f90c..be07332 100644
--- a/roles/heat/vars_test.go
+++ b/roles/heat/vars_test.go
@@ -36,4 +36,6 @@
 	require.NoError(t, err)
 
 	testutils.TestDatabaseConf(t, vals.Conf.Heat.Database)
+	testutils.TestAllPodsHaveRuntimeClass(t, vals)
+	testutils.TestAllPodsHavePriorityClass(t, vals)
 }