darwin afshelper fix startup check

darwin afshelper fix startup check

make the launchd check run as root without whining about passwords
repeatedly

Change-Id: Ib4bac7c9ddf1837a8e86bf17a8a66b6ba1247272
Reviewed-on: http://gerrit.openafs.org/1511
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 08aec0182a888f38fa50ca4e1dbd9ed83e022a2a)
Reviewed-on: http://gerrit.openafs.org/1516