tests/str: Verify standard-test-roles is installed

This tripped me up when regenerating my dev container.

Closes: #1509
Approved by: jlebon

tests/fedora-str/playbook-run.sh

@@ -19,6 +19,9 @@ EOF
 fi
 ls -al ${TEST_SUBJECTS}
 
+# This is required
+rpm -q standard-test-roles
+
 export ANSIBLE_INVENTORY=${ANSIBLE_INVENTORY:-$(test -e inventory && echo inventory || echo /usr/share/ansible/inventory)}
 ls -al /dev/kvm
 exec ansible-playbook --tags=atomic "$@"