Append PUAVO_TAG_* environment variables to /etc/environment
from puavo-configure-client (one environment variable for each tag).
Do append_tags_to_environment() in puavo-configure-client
in a separate function and do some input validation
(not all tags now go in).
Set timezone from /etc/puavo/device.json at device boot.
Support setting .keyboard_layout and .keyboard_variant
from /etc/puavo/device.json.
Explicitly test that "$puavo_timezone" != "null"
(even though the available timezone check catches that).
Change locale handling from 60-setup-locale to 61-puavo-setup-locale
and make it based on /etc/puavo/device.json.
Bring locales to user desktop session.
Update init-puavo.d/61-puavo-setup-locale to be in line with
/etc/X11/Xsession.d/41puavo-set-locale.
51-puavo-keyboard, 51-puavo-set-time and 61-puavo-setup-locale
should be run after 90-puavo-setup-puavo-config of course.
LANG=fi_FI.UTF-8 (default) should be echoed in 91-puavo-setup-locale,
of course.
Put back 60-setup-locale as it was and make 91-puavo-setup-locale
safer so that if it does not have any input, it will not mess up
/etc/default/locale.  This is for extra safety, the 60-setup-locale
should go eventually.
bootserver: script for updating tftpboot dirs with image kernels

It is basically a simplified and cleaner version of ltsp-update-kernels,
but it is NOT a drop-in replacement: it has a different name and uses
different environment variables (PUAVO_IMAGE_DIR and
PUAVO_TFTP_BOOT_DIR).

Use --help to get help.
client: Add intel-backlight hack also for HP Probook 430 G1
client: Add a new lightdm greeter-setup setup script to set keyboard
layout when the greeter starts.
client: Add a new lightdm greeter-setup setup script to set keyboard
layout when the greeter starts.
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 so that we can replace files
and start working without it.
client: Add prereq block in initramfs/puavo_ltsp script so that it is not
run during initramfs creation.
client: Remove init-puavo.d scripts that are not needed with Puavo.