This patch fixes two issues:
First, it fixes test failure due to GTID List events
having inconsistent ordering of domain ids. In
particular, this patch ensures that a GTID list log
event will have its GTIDs ordered by domain id
(ascending) followed by sequence number (ascending).
Second, it fixes an assert which could use an
unintialized variable.
Reviewed By:
============
Andrei Elkin <andrei.elkin@mariadb.com>
