Add .version to license.json files.  Parse json in puavo-image-preinst
(with jq), and use these version numbers to compare license versions.
Allows as changing software name (in UI) and license url,
even when license itself has not changed (we should of course
update our version numbers).
Provide some logging when updating restricted-packages
in puavo-image-preinst.
Revert "Allow wget to be verbose when downloading packages."

This reverts commit 1b08adcb6f8264bca68bba5393ee8488d6e43055.

Verbose was not to nice after all, in UI the error messages
are too long.
client: Add images.TOPDOMAIN and imageproxy.TOPDOMAIN to the DNS names
that are queried from the VPN GW instead of normal upstream DNS. These
are used for image updates.