Increase timeout when config components talk to zookeeper

This change is needed in scaled environments where api-requests
take longer times
Closes-bug: #1433886

Change-Id: I715645a91d90944e182b368da89f8daf5cc155b5

src/config/common/zkclient.py

@@ -201,7 +201,7 @@ def __init__(self, module, server_list, logging_fn=None):
         self._zk_client = \
             kazoo.client.KazooClient(
                 server_list,
-                timeout=20,
+                timeout=400,
                 handler=kazoo.handlers.gevent.SequentialGeventHandler(),
                 logger=logger)