repmgrd: don't wait for WAL receiver to reconnect during failover

If the WAL receiver has been temporarily disabled, we don't want to
wait for it to start up as it may not be able to at that point; we do
however need to reset "wal_retrieve_retry_interval".

sysutils.c

@@ -276,7 +276,7 @@ disable_wal_receiver(PGconn *conn)
 }
 
 pid_t
-enable_wal_receiver(PGconn *conn)
+enable_wal_receiver(PGconn *conn, bool wait_startup)
 {
 	char buf[MAXLEN];
 	int wal_retrieve_retry_interval;
@@ -326,6 +326,9 @@ enable_wal_receiver(PGconn *conn)
 				 wal_retrieve_retry_interval);
 	}
 
+	if (wait_startup == false)
+		return UNKNOWN_PID;
+
 	for (i = 0; i < timeout; i++)
 	{
 		wal_receiver_pid = (pid_t)get_wal_receiver_pid(conn);