While deploying an upgrade of the pulsar 3.10, broker and bookkeeper were restarted at the same time

[shamindra-sen]

While deploying an upgrade of the pulsar 3.10, first zookeeper and the proxies were restarted, then bookkeeper and broker were restarted at the same time.

Broker and Bookkeeper shouldn't restart at the same time. Proxy should be restarted only after brokers are up.

Here's an similar open issue: #166