Network stack cloning / virtualization patches for 4.9-RELEASE

[Marko Zec]

A new snapshot of network stack cloning patchset against 4.9-RELEASE 
kernel can be found at the usual place:

http://www.tel.fer.hr/zec/vimage/

What's new:

- support for independent IP multicast routing / forwarding in each 
network stack / virtual image;
- virtual images can now be deleted more or less reliably;
- jails can be (again) created within the virtual images;
- several minor bugfixes.

Have fun,

Marko