Merge pull request ceph#62880 from kshtsk/wip-random-sample-population

qa/tasks/ceph_manager: population must be a sequence

Author: kshtsk

qa/tasks/ceph_manager.py

@@ -2298,7 +2298,7 @@ def get_pool(self):
         """
         with self.lock:
             if self.pools:
-                return random.sample(self.pools.keys(), 1)[0]
+                return random.sample(list(self.pools.keys()), 1)[0]
 
     def get_pool_pg_num(self, pool_name):
         """