Add guard rails against manipulating mirrors

Snapshot mirrors should normally be promoted using "mirror promote", and
not started manually. This adds guard rails against that to the "start",
"stop", and "disable" state commands to prevent changing mirror states
without an explicit "--force" option.

client-cli/pvc/lib/vm.py

@@ -383,8 +383,8 @@ def vm_state(config, vm, target_state, force=False, wait=False):
     """
     params = {
         "state": target_state,
-        "force": str(force).lower(),
-        "wait": str(wait).lower(),
+        "force": force,
+        "wait": wait,
     }
     response = call_api(config, "post", "/vm/{vm}/state".format(vm=vm), params=params)