Added an AUTH_HELPER for revocation certificates

src/libstrongswan/credentials/sets/auth_cfg_wrapper.c

@@ -132,7 +132,8 @@ static bool enumerate(wrapper_enumerator_t *this, certificate_t **cert)
 			}
 		}
 		else if (rule != AUTH_HELPER_SUBJECT_CERT &&
-				 rule != AUTH_HELPER_IM_CERT)
+				 rule != AUTH_HELPER_IM_CERT &&
+				 rule != AUTH_HELPER_REVOCATION_CERT)
 		{	/* handle only HELPER certificates */
 			continue;
 		}