Move file path functions into utils/file_path.py.

These are useful functions by themselves.

R=vadimsh@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/24813003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/swarm_client@225565 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed