Reduce tracing level of messages logged.

[janvda]

Currently this container image is tracing also debug and info messages in the log file. Is there a way to reduce the number of messages logged ? E.g. I am thinking of no longer logging the debug and info messages by default.

An example extract of what is currently logged:

...
27.08.19 22:00:17 (+0200)  pulseaudio-server  I: [pulseaudio] (alsa-lib)pcm_hw.c: open '/dev/snd/pcmC0D1p' failed (-16)
27.08.19 22:00:17 (+0200)  pulseaudio-server  I: [pulseaudio] alsa-util.c: Error opening PCM device hw:0,1: Resource busy
27.08.19 22:00:17 (+0200)  pulseaudio-server  E: [pulseaudio] module.c: Failed to load module "module-alsa-sink" (argument: "device=hw:0,1"): initialization failed.
27.08.19 22:00:17 (+0200)  pulseaudio-server  I: [pulseaudio] module.c: Loaded "module-http-protocol-tcp" (index: #27; argument: "").
27.08.19 22:00:17 (+0200)  pulseaudio-server  I: [pulseaudio] module.c: Loaded "module-native-protocol-unix" (index: #28; argument: "auth-anonymous=1 socket=/pulseaudio/unix_socket").
27.08.19 22:00:17 (+0200)  pulseaudio-server  W: [pulseaudio] server-lookup.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
27.08.19 22:00:17 (+0200)  pulseaudio-server  W: [pulseaudio] main.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
27.08.19 22:00:17 (+0200)  pulseaudio-server  I: [pulseaudio] main.c: Daemon startup complete.
27.08.19 22:00:17 (+0200)  pulseaudio-server  I: [pulseaudio] module.c: Unloading "module-null-sink" (index: #14).
27.08.19 22:00:17 (+0200)  pulseaudio-server  D: [avahi-ml] module-zeroconf-publish.c: Successfully created entry group for root@ba7c427: USB Camera-B4.09.24.1.
27.08.19 22:00:17 (+0200)  pulseaudio-server  D: [pulseaudio] module-rescue-streams.c: No sink inputs to move away.
27.08.19 22:00:17 (+0200)  pulseaudio-server  D: [pulseaudio] sink.c: auto_null: state: IDLE -> UNLINKED
27.08.19 22:00:17 (+0200)  pulseaudio-server  D: [pulseaudio] module-rescue-streams.c: No source outputs to move away.
27.08.19 22:00:17 (+0200)  pulseaudio-server  D: [pulseaudio] source.c: auto_null.monitor: state: IDLE -> UNLINKED
27.08.19 22:00:17 (+0200)  pulseaudio-server  D: [pulseaudio] core-subscribe.c: Dropped redundant event due to change event.
27.08.19 22:00:17 (+0200)  pulseaudio-server  D: [pulseaudio] core-subscribe.c: Dropped redundant event due to remove event.
27.08.19 22:00:17 (+0200)  pulseaudio-server  D: [pulseaudio] core-subscribe.c: Dropped redundant event due to remove event.
27.08.19 22:00:17 (+0200)  pulseaudio-server  D: [pulseaudio] core-subscribe.c: Dropped redundant event due to remove event.
27.08.19 22:00:17 (+0200)  pulseaudio-server  D: [null-sink] module-null-sink.c: Thread shutting down
27.08.19 22:00:17 (+0200)  pulseaudio-server  I: [pulseaudio] sink.c: Freeing sink 0 "auto_null"
27.08.19 22:00:17 (+0200)  pulseaudio-server  I: [pulseaudio] source.c: Freeing source 0 "auto_null.monitor"
27.08.19 22:00:17 (+0200)  pulseaudio-server  I: [pulseaudio] module.c: Unloaded "module-null-sink" (index: #14).
...