feature: follower writes #247
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Description
Implements "backward" replication and in-turn follower write API. Follower clusters could write using Put, DeleteRange and Txn Ops. The call will be proxied to the leader cluster and awaited for the propagation of the revision in which it was written at the leader.
Related Issue
Fixes: #112
Fixes: #113
Motivation and Context
Change necessary to provide ability to replicate data in between followers.
Important
In this version the latency of the follower write is about
0.9 * replication.poll-interval. (read pretty high) The followup to this PR should improve that number dramatically.How Has This Been Tested?