Enable automatic command and one-liner doc. Reformat pydoc accordingly.
Add parser as an argument and parse_args hook in preparation to move parse_args at the right place, inside the CMDxx functions.
Update unit tests

Review URL: http://codereview.chromium.org/2129005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@47449 0039d316-1c4b-4281-b951-d872f2087c98