[kudu-CR] WIP [master] Add a rebalance request/response and provide a tool, refact master's rebalance

["Yuqi Du (Code Review)" <ge...@cloudera.org>]

Hello Tidy Bot, Alexey Serbin, Kudu Jenkins, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/18402

to look at the new patch set (#13).

Change subject: WIP [master] Add a rebalance request/response and provide a tool, refact master's rebalance
......................................................................

WIP [master] Add a rebalance request/response and provide a tool, refact master's rebalance

1. Refact master's auto rebalance, enable/disable auto rebalancer
need not restart master.

2. Add a rebalance request/response, user can trigger rebalance task,
even if the rebalancer is disabled.

3. Add a new rebalance tool, and compatible with incoming's leader
rebalance.

Change-Id: I5d506d877662c029a30dca9dd5029b9da4162946
---
M src/kudu/master/auto_rebalancer.cc
M src/kudu/master/auto_rebalancer.h
M src/kudu/master/catalog_manager.cc
M src/kudu/master/catalog_manager.h
M src/kudu/master/master.proto
M src/kudu/master/master_service.cc
M src/kudu/master/master_service.h
M src/kudu/tools/kudu-tool-test.cc
M src/kudu/tools/tool_action_cluster.cc
M src/kudu/util/threadpool-test.cc
10 files changed, 335 insertions(+), 70 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/02/18402/13
-- 
To view, visit http://gerrit.cloudera.org:8080/18402
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I5d506d877662c029a30dca9dd5029b9da4162946
Gerrit-Change-Number: 18402
Gerrit-PatchSet: 13
Gerrit-Owner: Yuqi Du <sh...@gmail.com>
Gerrit-Reviewer: Alexey Serbin <al...@apache.org>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Tidy Bot (241)
Gerrit-Reviewer: Yuqi Du <sh...@gmail.com>