Fix to bug #590, http://bugs.mariadb.com/show_bug.cgi?id=590
readwritesplit.c:execute_sescmd_in_backend didn't set GWBUF_TYPE_SESCMD type to GWBUF the command is in. Thus reply wasn't processed properly. Instead all replies were sent to client.
Merge branch 'develop' of https://github.com/mariadb-corporation/MaxScale into develop