Fix reloads of aliased CLI commands. Due to changes done to turn it into a...

Fix reloads of aliased CLI commands. Due to changes done to turn it into a single memory allocation we can't just use the existing CLI alias structure. We have to destroy all existing ones and then create new ones.
(closes issue #14054)
Reported by: pj


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@162923 65c4cc65-6c06-0410-ace0-fbb531ad65f3