Add the chroot creator to the default set of allowed groups (with override flag).
Add the chroot creator to the default set of allowed groups (with override flag).

This fixes a buildbot issue where chroots can't be used without sudo (because there is no 'admin' group, and chrome-bot only belongs to the 'chrome-bot' group).

Review URL: http://codereview.chromium.org/3755010

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@62790 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser