open a temporary file to receive the output from cli commands

invoked through the http interface.

It is not terribly efficient but better than no output at all.
Todo: use a configurable /tmp directory instead of a hardwired one.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@45330 65c4cc65-6c06-0410-ace0-fbb531ad65f3