Remove misleading authorization error message in cert-request with --add

https://fedorahosted.org/freeipa/ticket/4540

Reviewed-By: Martin Kosek <mkosek@redhat.com>

ipalib/plugins/cert.py

@@ -365,11 +365,7 @@ class cert_request(VirtualCommand):
             if not add:
                 raise errors.NotFound(reason=_("The service principal for "
                     "this request doesn't exist."))
-            try:
             service = api.Command['service_add'](principal, force=True)
-            except errors.ACIError:
-                raise errors.ACIError(info=_('You need to be a member of '
-                    'the serviceadmin role to add services'))
         service = service['result']
         dn = service['dn']