Merge "Fix exit code with bogus command name"

releasenotes/notes/cli-exit-code-1e6278f803dbf8e2.yaml

+---
+fixes:
+  - |
+    Fixes an issue where ``kolla-ansible`` exits with a zero exit code when
+    executed with a bogus command name. `LP#1929397
+    <https://bugs.launchpad.net/kolla-ansible/+bug/1929397>`__

tools/kolla-ansible

@@ -494,7 +494,7 @@ EOF
         exit 0
         ;;
 (*)     usage
-        exit 0
+        exit 3
         ;;
 esac