Import update changelog as released by Steve Beattie

debian/changelog

-mariadb-5.5 (5.5.47-1ubuntu0.14.04.2) trusty-updates; urgency=low
-
-  * New upstream release
+mariadb-5.5 (5.5.47-1ubuntu0.14.04.1) trusty-security; urgency=low
+
+  * SECURITY UPDATE: New upstream release 5.5.47
+    - CVE-2016-0546
+    - CVE-2016-0505
+    - CVE-2016-0596
+    - CVE-2016-0597
+    - CVE-2016-0616
+    - CVE-2016-0598
+    - CVE-2016-0600
+    - CVE-2016-0606
+    - CVE-2016-0608
+    - CVE-2016-0609
+    - CVE-2016-2047
     - Adds the mariadb-slow.log into the logrotate file, as the file
       name mariadb-slow.log is the log name in the default config file.