tree 909486879db377c689858357a645850fb79307af
parent 4941c6b54c80dcf8635e24e0bdee2cf0062c2931
author Steve Fung <stevefung@chromium.org> 1391559295 -0800
committer chrome-internal-fetch <chrome-internal-fetch@google.com> 1391746564 +0000

Remove color from output when outputting to a pipe

Remove color output from info, warn, and error messages when the
output is to a pipe.

BUG=none
TEST=`./package_dependency_list.sh --board=beaglebone gflags` output
  is in color
TEST=`./package_dependency_list.sh --board=beaglebone gflags | cat`
  output is not in color
TEST=`cbuildbot --remote -g 184938 chromiumos-sdk x86-generic-paladin\
  amd64-generic-paladin daisy-paladin` all pass

Change-Id: Id54e2862d075874d8929679962b8b70f21857b06
Reviewed-on: https://chromium-review.googlesource.com/184938
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Steve Fung <stevefung@chromium.org>
Tested-by: Steve Fung <stevefung@chromium.org>
Commit-Queue: Steve Fung <stevefung@chromium.org>