client: Fix initramfs script to check for existence of /sbin/ethtool
when copying it.
client: remove 50-fstab modification script

NFS support is done from PAM scripts with Puavo, we don't need modify
fstab dynamically.
client: remove unused module loading support
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: 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: run ltsp[guest]ssh servers only on ltspservers
tools: fix wrong variable name in PHONY targets
tools: add help to OTHER_TARGETS
install: call UpdateImages asynchronously

The call is potentially longstanding, we do not want to block the applet
for the duration of the call. Currently we do not have any other error
handling mechanism than to just output all errors.