This variable indicates which Internet Protocol version should be enabled
in DHCP server, because ISC DHCP server supports only 1 version active
at a time.
You can enable installation of DHCP relay instead of the server via
'dhcpd_mode' variable. By default, relays send the packets to their
network gateway, but that might not be what you really want; however
selection of correct DHCP server can be performed by specifying it in
'dhcpd_relay_servers' list.
This patch renames all role directories from 'ginas.' to 'debops.'
prefix, no other changes should be expected. Some script names are also
changed, but that shouldn't affect normal operations.
