In puavo-install, when installing laptop/wirelessaccesspoint,
do call /usr/lib/puavo-ltsp-install/update-configuration directly
instead of going through puavo-update-client/puavo-client-daemon.
The previous was wrong now that puavo-update-client is asynchronous.
In puavo-install, do an image update right after configuration update,
in case configurations suggest some other image for this host.
(A different image might be defined by school, and we do not know
that before registering and reading configurations.  It also does not
hurt to have two images right away.)