This option specifies value of Calling-Station-Id value.
Available options are 'mac' and 'ip'.

Default behaviour of accel-ppp when it receives DHCP request with same Option 82 but different MAC address
is termination of old session (with previous MAC address).
This option can turn off such behaviour, so multiple sessions with same Option 82 but different MAC may coesist.

Before this patch if agent-remote-id is not specified in config it get default value "accel-pppd".
Now if agent-remote-id is not specified then accel-ppp will not insert his Option 82 into relayed DHCP requests

ipoe: remove NETIF_F_HW_VLAN_CTAG_FILTER from virtual device features (fixed warn in register_netdevice) (v2)

Introducesed 2 new options:
[ipoe]
attr-dhcp-opt82-remote-id=
attr-dhcp-opt82-circuit-id=

Soft termination means that session won't be terminated immediately, but marked as terminated
and when client will request for lease renewal it will be NAKed and session will be terminated at this time.
By default soft termination is turned off, to enable it introduces new option 'soft-terminate=1'.
Also cli command 'terminate <session> hard' terminates session immediatly regardless of 'soft-terminate' option.