* Add a new version of the chromite wrapper as chromite_wrapper
* Create symlinks (chromite, cros_sdk, cbuildbot) pointing to it

TEST=inside repo checkout, run cros_sdk, chromite, cbuildbot
Review URL: http://codereview.chromium.org/7484062

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@94011 0039d316-1c4b-4281-b951-d872f2087c98