bin/audio_test.py: Fix the "Unable to control recording volume..." bug

Fix: 1. Remove the method parameter from PAVolumeController.__init__(): Assum PAVolumeController class only be used in this audio_test.py. 2. Don't check the return value of self.method(command): In PAVolumeController._pactl_output(), when failed to execute the pactl command the exception will be thrown. 3. When pactl command fail (after retry 3 times), let audio_test stop. Original issue: In PAVolumeController class: In set_volume() and mute(), the self.method(command) returns a zero-length string. So, the set_volume() and mute() always return False. Then, in get_volume(), the self._volume always won't be set. This is the root cause of the "Unable to control recording volume..." issue. More detail: 1. There is no ouptu from the `pactl set-souerce-volume ...` command. 2. The PAVolumeController._pactl_output fucntion will return subprocess.check_output(). The subprocess.check_output function return the output of "command". LP: #1890526 

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