connectd: Add new failure mode for connetd

We need a way to indiciate failure of the batching system in connectd.

Author: ddustin

common/status_levels.h

@@ -37,6 +37,9 @@ enum status_failreason {
 	/* Gossipd sent unknown/malformed command, or fd failed */
 	STATUS_FAIL_GOSSIP_IO,
 
+	/* Connect daemon received a malformed protocol_batch_element */
+	STATUS_FAIL_PROTO_BATCH,
+
 	/* Other internal error. */
 	STATUS_FAIL_INTERNAL_ERROR,
 };

lightningd/subd.c

@@ -405,6 +405,9 @@ static bool log_status_fail(struct subd *sd, const u8 *msg)
 	case STATUS_FAIL_GOSSIP_IO:
 		name = "STATUS_FAIL_GOSSIP_IO";
 		break;
+	case STATUS_FAIL_PROTO_BATCH:
+		name = "STATUS_FAIL_PROTO_BATCH";
+		break;
 	case STATUS_FAIL_INTERNAL_ERROR:
 		name = "STATUS_FAIL_INTERNAL_ERROR";
 		break;