[kudu-CR] [tools] Add tool 'perf table scan'

["Yingchun Lai (Code Review)" <ge...@cloudera.org>]

Hello Will Berkeley, Tidy Bot, Kudu Jenkins, Todd Lipcon, 

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

    http://gerrit.cloudera.org:8080/12516

to look at the new patch set (#6).

Change subject: [tools] Add tool 'perf table_scan'
......................................................................

[tools] Add tool 'perf table_scan'

This is useful to show row count and scanning time cost of
tablets in a table, we can use it to check whether there is
a row count skew in different tablets, or to check whether
there is a long tail to scan different tablets.

And also we do some refactor for tool 'perf loadgen' in this commit.

Change-Id: Ibebed05d9a91ae3f126d3cf2d92f66852b253edd
---
M src/kudu/tools/kudu-tool-test.cc
M src/kudu/tools/table_scanner.cc
M src/kudu/tools/table_scanner.h
M src/kudu/tools/tool_action_common.cc
M src/kudu/tools/tool_action_common.h
M src/kudu/tools/tool_action_perf.cc
M src/kudu/tools/tool_action_table.cc
7 files changed, 155 insertions(+), 107 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/16/12516/6
-- 
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ibebed05d9a91ae3f126d3cf2d92f66852b253edd
Gerrit-Change-Number: 12516
Gerrit-PatchSet: 6
Gerrit-Owner: Yingchun Lai <40...@qq.com>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Tidy Bot (241)
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>
Gerrit-Reviewer: Will Berkeley <wd...@gmail.com>
Gerrit-Reviewer: Yingchun Lai <40...@qq.com>