Fix hard-coded value for ceph-mds daemons expected

Signed-off-by: Tobias Wolf <[email protected]>

src/rookify/modules/migrate_mgrs/main.py

@@ -93,7 +93,7 @@ def _migrate_mgr(self, mgr_host: str) -> None:
 
         while True:
             result = self.ceph.mon_command("node ls")
-            if len(result["mgr"]) >= 3:
+            if len(result["mgr"]) >= mgr_count_expected:
                 break
 
             sleep(2)