[Users] new version of vznetaddroute script

[Gregor Mosheh]

Hey, guys. I've come up with a much more flexible version of the
vznetaddroute script described in the Wiki
http://wiki.openvz.org/Virtual_Ethernet_device#Making_a_veth-device_persistent

Improvements in my script are:
- multiple IPs can be specified! hello, ip aliases in VEs!
- nicer syntax and error checking

And actually, I find that entire section to be not particularly easy to
read and follow. Who do I contact for permission to rewrite that section?

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