WIP: Resolver_conf fix dhcp issues
This PR fixes dhcp issues related to https://gitlab.labs.nic.cz/turris/turris-build/blob/master/patches/openwrt/to-upstream/0015-dnsmasq-fix-dhcp-leases-script-execution.patch
And switches dhcp script to python3 https://gitlab.labs.nic.cz/turris/turris-os-packages/issues/464
Edited by Karel Koci