Make drover look a little bit more like the rest of

the python code we have. 90% of the changes are removing
trailing spaces.

Review URL: http://codereview.chromium.org/282014

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@29312 0039d316-1c4b-4281-b951-d872f2087c98