getMasterConnection() cannot avoid checking the same node that asks

to find the master.
This was a micro optimization based on the fact that all commands
that needed to detect the master were executed from the standby
but now that we have CLUSTER level commands that is not true anymore

dbutils.h

@@ -31,7 +31,7 @@ char   *pg_version(PGconn *conn, char* major_version);
 bool	guc_setted(PGconn *conn, const char *parameter, const char *op,
                    const char *value);
 const char	 *get_cluster_size(PGconn *conn);
-PGconn *getMasterConnection(PGconn *standby_conn, int id, char *cluster,
+PGconn *getMasterConnection(PGconn *standby_conn, char *cluster,
                             int *master_id, char *master_conninfo_out);
 
 #endif