[kudu-CR] [master] support enable/disable auto rebalancer by changing gflags when kudu-master running

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

Hello Tidy Bot, Kudu Jenkins, 

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

    http://gerrit.cloudera.org:8080/18679

to look at the new patch set (#5).

Change subject: [master] support enable/disable auto rebalancer by changing gflags when kudu-master running
......................................................................

[master] support enable/disable auto rebalancer by changing gflags when kudu-master running

kudu-master has supported auto-rebalancer, but it must decide whether
enable it before starting.

We can support to use auto_rebalancing_enabled to control whether enable/disable
auto-rebalancer when running.

Change-Id: Ifbcea6392b783843f89e019f1141dd8905366de5
---
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/util/threadpool.cc
5 files changed, 144 insertions(+), 86 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/79/18679/5
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ifbcea6392b783843f89e019f1141dd8905366de5
Gerrit-Change-Number: 18679
Gerrit-PatchSet: 5
Gerrit-Owner: Yuqi Du <sh...@gmail.com>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Tidy Bot (241)
Gerrit-Reviewer: Yuqi Du <sh...@gmail.com>