Set the role for inbound subscriptions correctly.

This was causing the AMI show_subscriptions test in
the testsuite to fail since all subscriptions were being
seen as subscribers instead of notifiers.
........

Merged revisions 421585 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@421586 f38db490-d61c-443f-a65b-d21fe96a405b