Add ability to extract values from the result set

Extract and action the @master_binlog_checksum value

Store master's uuid for use in show slave status

Support for MariaDB 5.5 masters

server/modules/routing/binlog/blr.c

@@ -181,6 +181,8 @@ unsigned char	*defuuid;
 	spinlock_init(&inst->binlog_lock);
 
 	inst->binlog_fd = -1;
+	inst->master_chksum = true;
+	inst->master_uuid = NULL;
 
 	inst->low_water = DEF_LOW_WATER;
 	inst->high_water = DEF_HIGH_WATER;