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Makes sure that IP assigned to the router doesn't change in case there
is a switch connected to the device as well.

We don't have turris-netboot group, so don't try to make it own data.

Work even if the counterpart is using old protocol

* root/turris-netboot permissions related issues
* remove network restart (not necessary init will trigger it later)
* fosquitto configuration fixes
* remote CA unpack fix