Doesn't have any sensitive info right now but might in the future. Fixes #142
Removes a lot of 'sudo -E' usage, and eventually should let us get rid of the $PATH override for jupyterhub-admins, which arguably is less secure than just dropping stuff into /usr/bin Also remove sudo -E from apt and mkdir calls. Not necessary.
imported from acl-based tests test for admin-install permissions are included but skipped as xfail