resolver-conf: add dhcp hotplug script

Jan Pavlinecrequested to merge
hotfix/resolver-hotplug-script into master

This PR adds hotplug script which calls dynamic domains python script. The reason for this interlayer is, that hotplug scripts can be only shell scripts.

Fixes https://gitlab.labs.nic.cz/turris/turris-os-packages/issues/586

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