[ISSUE #54 #50] Operator multiple mq cluster && start sequence#56

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linjiemiao wants to merge 2 commits intoapache:masterfrom

silotrd:issue-54-codereview

Commits on Sep 22, 2020

1. ensure rocketmq-operator can operator more than one rocketmq cluster.
linjiemiao
committed
1. fixed bug, if nameserver.spec.size is 0, need requeue
linjiemiao
committed