Mention TROVE-2017-007 in changes file for 22789

changes/bug22789

@@ -2,5 +2,6 @@
     - Avoid an assertion failure bug affecting our implementation of
       inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
       handling of "0xfoo" differs from what we had expected.
-      Fixes bug 22789; bugfix on 0.2.3.8-alpha.
+      Fixes bug 22789; bugfix on 0.2.3.8-alpha. Also tracked as
+      TROVE-2017-007.