Merge pull request #21313 from ceph/wip-pg-clean-timeout

qa/tasks: Add default timeout for wait for pg clean task

Reviewed-by: Josh Durgin <jdurgin@redhat.com>

qa/tasks/ceph_manager.py

@@ -2091,7 +2091,7 @@ def is_active_or_down(self):
         """
         return self.get_num_active_down() == self.get_num_pgs()
 
-    def wait_for_clean(self, timeout=None):
+    def wait_for_clean(self, timeout=1200):
         """
         Returns true when all pgs are clean.
         """