Add audio support in chroot, by forwarding audio to cras (Chromium OS audio server).
 - Bind mount /var/run/cras.
 - Compile and install cras ALSA plugin, and set it up as default device.
 - Remove pulseaudio if possible, then prevent it from being installed.
Fixes after review. Better pattern matching.
Remove access to hardware audio devices by default.
The recommended behaviour is to install the `audio` target, which
forwards the audio to CRAS (Chromium OS Audio Server).
Users who know what they are doing, and really need access to
hardware devices can add themselves to the group `hwaudio`.
Route audio from PulseAudio to CRAS.
audio: Improve awk script & other minor fixes.
Install PulseAudio configuration, even when it is not installed (yet).
Install pulseaudio-default.pa via CHROOTETC. Create symlink in home directory with a script in /etc/profile.d/.
audio: Fix description. Add x11/xephyr dependency on audio.
Merge remote-tracking branch 'drinkcat/audio'
Backing up resolv.conf is unnecessary now.
Manage group IDs via chroot commands, and add missing groups.
Add chrootcmd function to enter-chroot and use it for maintenance calls
"Cleaning up" text tweak