MariaDB10 binlog router compatibilty

In the binlog router machine for MariaDB10 compatibility SELECT VERSION and SELECT @@version_comment limit 1 were missing: those queries are now sent to master and the reply cached.

https://github.com/mariadb-corporation/MaxScale/tree/binlog_router_mariadb10

Now binlog router could be used with MariaDB 10 with this steps in maxscale.cnf:

[Binlog_Service]
type=service
router=binlogrouter
servers=master
version_string=10.0.17-MariaDB-log
router_options=mariadb10-compatibility=1,server-id=3,binlogdir=/usr/local/mariadb-maxscale/Binlog_Service

Currently MariaDB 10 compatibility doesn’t show all the MariaDB specific replication events via maxadmin “show services” and may be some fields in MySQL>SHOW SLAVE STATUS should be updated/added.