Redirection support for FreeNX sessions from bootserver to configured
LTSP server. When bootserver has a tag NX:ltspserver, it forwards
connections to port 222 to ltspserver.ltsp.puavo.domain:222. This way
users can connect to LTSP servers supporting NX from outside networks if
the firewall rules allow it.
Add script to update /etc/puavo/device.json on bootservers.
clinet: Do not mount home directory for nx user.
client: Call /usr/sbin/puavo-setup-freenx-server only on ltspservers
and separate the call to a new script.
Merge remote-tracking branch 'origin/freenx' into trusty

Add support for remote desktop sessions (via x2go and freenx).
Needs testing...