Changes file for 14710.

changes/ticket14710

+  o Code simplification and refactoring:
+    - Move the hacky fallback code out of get_interface_address6() 
+      into separate function and get it covered with unit-tests. Resolves
+      ticket 14710.
+
+  o Minor bugfixes:
+    - When attempting to use fallback technique for network interface
+      lookup, disregard loopback and multicast addresses since they are
+      unsuitable for public communications.
+