HTTP module memory leaks

(closes issue #13230)
 Reported by: eliel
 Patches: 
       res_http_post_leak.patch uploaded by eliel (license 64)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@135476 65c4cc65-6c06-0410-ace0-fbb531ad65f3