- various cleanup for DHCP
- fix "ipv6.dhcp-duid=lease" for dhclient plugin.
- expose
"dhcp_client_identifier"
/"dhcp6_client_id"
in lease file (D-Bus, /run) for internal clients.
"dhcp_client_identifier"
/"dhcp6_client_id"
in lease file (D-Bus, /run) for internal clients.