This release adds support for the new IPSec Interface XFRM.

This release adds support for the new IPSec Interface XFRM.
It is available since Kernel 4.19 and has two parmeters:

1. XFRM ID to map to an SA/SAs
2. Underlying Interface if you want to take advantage of IPSec Hardware Offload

Otherwise it is treated as a normal interface and not like a tunnel (VTI).

I added two attributes to the interface to configure it and otherwise use it as a normal interface.
One example is:

auto ipsec1
iface ipsec1 inet
	xfrm-physdev lo
	xfrmid 1