MXS-1209: added blr_handle_fake_gtid_list

New routine blr_handle_fake_gtid_list added for fake GTID_LIST_EVENT.

blr_file_append O_APPEND is set only if mariadb10_master_gtid is not
set.

blr_file_append() routine could change name in next commits

server/modules/routing/binlogrouter/blr.h

@@ -515,8 +515,6 @@ typedef struct
     GWBUF           *server_vars;       /*< MySQL Connector master server variables */
     GWBUF           *binlog_vars;       /*< SELECT @@global.log_bin, @@global.binlog_format, @@global.binlog_row_image; */
     GWBUF           *lower_case_tables; /*< select @@lower_case_table_names */
-    uint8_t         *fde_event;         /*< Format Description Event */
-    int             fde_len;            /*< Length of fde_event */
 } MASTER_RESPONSES;
 
 /**