Suppress ALSA trace log

[denis-stepanov]

When running AdVent, a lot of debug output is sent from ALSA to console at startup. Example log:

(advent-pyenv) ice:~/src/advent/advent> advent -t nil
AdVent v1.6b2
TV control is 'nil' with action 'mute' for 600 s max
TV status: unmuted, volume: 100
Recognition interval is 2 s with confidence of 10%
Started 2 listening thread(s)
Type 'h' for help
ALSA lib pcm.c:2721:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2721:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2721:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:878:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:878:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:878:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:878:(find_matching_chmap) Found no matching channel map
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
.....

The task would be to redirect this into AdVent's debug log, or to suppress altogether.