Watch leader key for fast failover #15
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`Cluster.leader` is not reference to `Member` anymore, but to `Leader` `Leader` class contains field `index` (update index). This field is very useful for watching for events which changing leader key. Also `Leader` contains `member` field, which should reference real member.
This method suppose to watch for changes of leader key if current node is not leader and also it could watch for changes in a members list if current conde is the leader.
It returns self.member.name and simplifies later usage in code.
Retry requests to configuration store
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