Current behavior in ConfBridge menu definitions is that first definition takes
precedence, even in templated situations. This change allows inheritance and
overriding to work as expected so that the last definition takes precedence.
(closes ASTERISK-17986)
Review: https://reviewboard.asterisk.org/r/1267/
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@323272 65c4cc65-6c06-0410-ace0-fbb531ad65f3