codeintel: xpcom-completer: don't attempt to access self._sock before it's ready
http://bugs.activestate.com/show_bug.cgi?id=100235

Just do the init on the background thread instead

(integrated from komodo (trunk) change 81767 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13588 b87d16e7-d29f-4ee1-b5ec-817d645d335f