merlimat opened a new pull request #1583: Let Proxy handle ZK session expires 
without restarting
   ### Motivation
   Currently pulsar proxy process might get stuck when receiving a ZK session 
expired event.
   ### Modifications
    * Imported reconnectable `ZookeeperClient` wrapper from BK and added option 
to configure ZK read-only session. Once this fix will go into 4.8, we'll remove 
the code here.
    * Use reconnection logic from `ZookeeperClient` to handle expired sessions. 
Since the proxy doesn't have any locks on zookeeper, there's no reason to 
restart the process. Proxy should always stay up and keep trying reconnecting 
to ZK.

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