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

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.

If password=csid then password will we same as Calling-Station-Id.

This reverts commit c362f0d1.

Introduced following options:
attr-l4-redirect-table (type integer)
attr-l4-redirect-ipset (type string)
Please note, to enable L4 redirect attr-l4-redirect must be specified and sent

If authentication rejects session, but l4-redirect-on-reject is specified in config then
temporary session will be created and l4 redirect rule will be applied to IP of that session.
Session will be terminated after specified number of seconds.
Also if l4-redirect-ip-pool option is specified then IP will be allocated from that special pool.

If authentication rejects session, but l4-redirect-on-reject is specified in config then
temporary session will be created and l4 redirect rule will be applied to IP of that session.
Session will be terminated after specified number of seconds.
Also if l4-redirect-ip-pool option is specified then IP will be allocated from that special pool.

This patch gets rid of synchronuos style of authentication/accounting.
Synchronous style of authentication/accounting produced sleeping threads
which becomes a problem when lots of sessions started/stopped and all they want authorization/accounting.

To enable this specify attr-opt82 option in [ipoe] section.
Attribute must be octet type.

ipoe: introduced attr-dhcp-lease-time option to specify radius attribute to pass dhcp lease time (attribute must be integer)