iproute2: ISATAP potential router list

iproute2: ISATAP potential router list

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Hi Stephen,

please review attached patch to add support for in-kernel potential router=
=20
lists for ISATAP tunnels.

Usage:
ip tunnel add name isatap0 mode isatap local 192.168.1.100
ip tunnel prl dev isatap0 prl-default 192.168.1.1
ip tunnel prl dev isatap0 prl-nodefault 192.168.1.2
ip tunnel prl dev isatap0 prl-delete 192.168.1.1
ip tunnel show # pr and pdr will be listed as well

Patch based on http://osprey67.com/seal/iproute2_diff.v0_3.txt by Fred L.=20
Templin.

Thanks,
Sascha