main/dhcp: fix vrf support
dhcrelay init.d overrides start(), due to this the built in vrf support in openrc does not work. Due to this dhcrelay init.d must handle the vrf support.
dhcrelay init.d overrides start(), due to this the built in vrf support in openrc does not work. Due to this dhcrelay init.d must handle the vrf support.