Since this code now uses the API call for creating a detached thread, there

is no reason to keep a thread attribute structure on the conference structure.
(Pointed out by Tony Mountifield on the asterisk-dev list)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@66208 65c4cc65-6c06-0410-ace0-fbb531ad65f3