do not exit in getMasterConnection()

dbutils.c

@@ -359,8 +359,7 @@ getMasterConnection(PGconn *standby_conn, char *schema, char *cluster,
 		log_err(_("Can't get nodes info: %s\n"),
 		        PQerrorMessage(standby_conn));
 		PQclear(res1);
-		PQfinish(standby_conn);
-		exit(ERR_DB_QUERY);
+		return NULL;
 	}
 
 	for (i = 0; i < PQntuples(res1); i++)

repmgr.c

@@ -1433,6 +1433,11 @@ do_standby_follow(void)
 
 	do
 	{
+		if (!is_pgup(conn, options.master_response_timeout))
+		{
+			conn = establishDBConnection(options.conninfo, true);
+		}
+
 		master_conn = getMasterConnection(conn, repmgr_schema,
 		                                  options.cluster_name, &master_id,(char *) &master_conninfo);
 	}