[api] OPSAPS-32658. Support pools refresh starting v6

Since it's actually been around for a while.

(cherry picked from commit ff09be8)
(cherry picked from commit 8846594073fe12823afb3ef17757dd8cc823debd)

Author: hermancc

python/src/cm_api/endpoints/clusters.py

@@ -626,9 +626,9 @@ def pools_refresh(self):
     Refresh Dynamic Pools configurations for relevant services..
 
     @return: Reference to the submitted command.
-    @since: API v12
+    @since: API v6
     """
-    return self._cmd('poolsRefresh')
+    return self._cmd('poolsRefresh', api_version=6)
 
   def list_dfs_services(self, view=None):
     """