Avoid creating failure-domain for cluster which doesn't exist #1474
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Motivation
Right now, if cluster is not created yet then broker creates empty cluster-znode in order to create failure-domain under cluster. It creates conflict when we really want to create cluster in pulsar.
Modifications
Avoid creating failure-domain znode if cluster is not created yet. It reverts some of the test-case changes made in #896
Result
It will not create any conflict while creating cluster in the system.