Improve the check for whether the user is in the admin group
Improve the check for whether the user is in the admin group

Previously this check would also match if the user was part of another
group that included the word admin (e.g. _lpadmin). Now limit the check
to only look for the whole word 'admin'.

mikemcquaid/strap,mikemcquaid/strap,mikemcquaid/strap