[kudu-CR] Add some path / env related helper functions

["Mike Percy (Code Review)" <ge...@cloudera.org>]

Hello Kudu Jenkins,

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

    http://gerrit.cloudera.org:8080/5618

to look at the new patch set (#3).

Change subject: Add some path / env related helper functions
......................................................................

Add some path / env related helper functions

* path_util: Add SplitPath() helper function

  This function provides a (theoretically) portable method of splitting
  a filesystem path into its constituent components.

* env: Add GetCurrentWorkingDir() and ChangeDir()

  These are functions that were missing from our Env implementation.

* env_util: Implement CreateDirsRecursively()

  This function is similar in spirit to the "mkdir -p" command.

  Also reordered a few includes and deleted a few lines of commented-out code.

Change-Id: Ia664708a09493923abbf2ff4e56e3d49c62cf97e
---
M src/kudu/util/env-test.cc
M src/kudu/util/env.h
M src/kudu/util/env_posix.cc
M src/kudu/util/env_util-test.cc
M src/kudu/util/env_util.cc
M src/kudu/util/env_util.h
M src/kudu/util/path_util-test.cc
M src/kudu/util/path_util.cc
M src/kudu/util/path_util.h
9 files changed, 182 insertions(+), 9 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/18/5618/3
-- 
To view, visit http://gerrit.cloudera.org:8080/5618
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ia664708a09493923abbf2ff4e56e3d49c62cf97e
Gerrit-PatchSet: 3
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Adar Dembo <ad...@cloudera.com>
Gerrit-Reviewer: Dinesh Bhat <di...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Mike Percy <mp...@apache.org>
Gerrit-Reviewer: Tidy Bot
Gerrit-Reviewer: Todd Lipcon <to...@apache.org>