finalize changelog for mariadb-10.1 (10.1.23-9+deb9u1), upload to stretch

debian/changelog

+mariadb-10.1 (10.1.23-9+deb9u1) stretch; urgency=medium
+
+  [ Ondřej Surý ]
+  * Add Breaks: cqrlog (<< 1.9.0-5~) to ensure correct upgrade order
+    (Closes: #864159)
+
+ -- Andreas Beckmann <anbe@debian.org>  Wed, 07 Jun 2017 21:11:23 +0200
+
 mariadb-10.1 (10.1.23-9) unstable; urgency=medium
 
   * Fix the invalid location of insserv configuration snippet