This fix solves problem with intense squelch noise when someone joins conf in bug...

This fix solves problem with intense squelch noise when someone joins conf in bug 9430; We repro'd the problem with meetme opts of 'CciMo'; Josh Colp supplied this patch, and I'm applying it. It looks like playing the recorded username will louse up the next thing played into the channel. Josh rearranged the code so as to start things over before playing data directly into the conference.

git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@77191 614ede4d-c843-0410-af14-a771ab80d22e