common: Updated changelog

common/debian/changelog

+symbiosis-common (2015:1217) stable; urgency=medium
+
+  * Added --list and --select options for symbiosis-ssl
+  * Self-signed certs are no longer chosen for roll-over unless the SSL
+    provider is explcitly set to self-signed.
+
+ -- Patrick J Cherry <patrick@bytemark.co.uk>  Tue, 24 May 2016 22:19:40 +0100
+
 symbiosis-common (2015:1216) stable; urgency=medium
 
   * Raise an error if the getpwent memory bug hits (closes #12783).