MXS-1209: Master GTID Registration, part1

New option ‘mariadb10_master_gtid’ in use.
Only MariaDB 10 Slaves with GTID request can register if the option is
set.
When receiving a Master reply to a GTID request and the GTID_LIST is
seen, an IGNORABLE event could be written at the end of file if
GTID_LIST next_pos is beyond that EOF

server/modules/routing/binlogrouter/blr.h

@@ -189,6 +189,13 @@ enum blr_aes_mode
  */
 #define BLR_REQUEST_ANNOTATE_ROWS_EVENT         2
 
+/** MaxScale generated events */
+typedef enum
+{
+    BLRM_IGNORABLE,          /*< Ignorable event */
+    BLRM_START_ENCRYPTION    /*< Start Encryption event */
+} generated_event_t;
+
 /**
  * How often to call the binlog status function (seconds)
  */