ipv6: ip6mr: support multiple independant multicast routing instances

The following patches add support for multiple independant IPv6 multicast
routing instances. This can be useful to seperate traffic when building
a multicast router that is serving multiple independant networks.

The patchset is pretty much a straight forward port from IPv4 with no
significant differences.

The patchset consists of the following parts:

- Patch 01-04 contain some preparatory work and cleanup for supporting
  multiple multicast routing instances.

- Patch 05 contains the actual changes to support multiple multicast
  routing instances.

- Patch 06 adds support for dumping multicast routing routes from all
  tables over netlink.

These patches have been tested using pim6sd and mrd6.

Please apply or pull from:

git://git.kernel.org/pub/scm/linux/kernel/git/kaber/ipmr-2.6.git master

Thanks!
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