Make 'permission' the default bind type for managed permissions
This reduces typing (or copy/pasting), and draws a bit of attention
to any non-default privileges (currently 'any' or 'anonymous').
Leaving the bindtype out by mistake isn't dangerous: by default
a permission is not granted to anyone, since it is not included in
any priviliges.
Reviewed-By: Martin Kosek <mkosek@redhat.com>