client: Fix initramfs script to check for existence of /sbin/ethtool
when copying it.
client: run ltsp[guest]ssh servers only on ltspservers
client: conflict with ltsp-client-core

puavo-ltsp-client replaces few files from ltsp-client-core
client: add prereq block in initramfs/puavo_ltsp script

Otherwise it is run during initramfs creation.
client: remove init-puavo.d scripts that are not needed with Puavo
client: adopt jetpipe script from ltsp-client-core package
client: remove 50-fstab modification script

NFS support is done from PAM scripts with Puavo, we don't need modify
fstab dynamically.
client: add initramfs hook to copy aufs/overlayfs modules to initrd
client: remove unused module loading support
client: remove more unused init-puavo.d scripts
client: use /etc/puavo/device.json instead of /etc/lts.conf
client: install ipsec and sssd network scripts directly under /etc

Previously they were copied during boot. This makes the boottime setup
simpler and less intrusive as there are no variables in the files.
client: remove dependency on /usr/share/ltsp/ltsp-client-functions
client: rename xinitrc to setup-lightdm-display

The new name describes better what the script actually does.
client: remove LTSP's xorg.conf creation code

It does not work anymore, so remove it for now.
client: do not set LDM_SERVER anymore

ltspserver is determined dynamically in login scripts so setting
LDM_SERVER is not needed.
client: remove puavo-wlanap related lts.conf parsing

puavo-wlanap settings are fetched dynamically when it starts, so no
lts.conf parsing is needed here.
client: always call exit 0 from setup-lightdm-display

This ensures lightdm doesn't fail even if xbacklight fails.
Merge remote-tracking branch 'origin/no-ltsp-client.v2' into trusty

Conflicts:
	client/templates/etc/lightdm/lightdm.conf

Conflict resolution:

lightdm.conf in trusty was using xinitrc as its display-setup-script,
but no-ltsp-client.v2 renamed it to setup-lightdm-display.
client: adopt two remaining xinitrc scripts into setup-lightdm-display