More audiod fixes

More audiod fixes

The bug-quality rises. This patch fixes

	the select timeout after receiver open. As the pre_select
	function of the receiver just opened will be called _after_
	the upcoming select call, we might block for the time of that
	call. Only afterwards, the receiver can change the timeout. Fix
	this problem by changing the timeout to a minimum from within
	start_receiver() (which gets called by audiod_pre_select()).

	Resume on server restart. This was broken by design as it
	used sleep() and also caused problems with the alsa writer
	being restarted too early. We can do much better with the
	new scheduler, so introduce a new field "restart_barrier" in
	struct status_task and restart para_client and the receivers
	not before this time.

Also, set the default timeout to a ridiculous value to detect further
timeout problems and do not kill the decoders even if the status pipe
went south.