* origin/pr/352:
audio: set sink volume to workaround alsa save/restore issue
audio: increase timeout to match hvm loading
audio: auxiliary pauses should be harmless now, place them back just in case
audio: add silence threshold
audio: unload guest' module-vchan-sink in hvm tests
audio: fix prepare_audio_vm
audio: do not use pacat on copying audio_in.raw
Audio: rework audio tests