net: support multiple independant multicast routing instances

The following patches add support for multiple independant multicast
routing instances. This can be useful to seperate traffic when building
a multicast router that is serving multiple independant networks. Patch
09 contains a more detailed description of this feature in the changelog.

The patchset consists of the following parts:

- Patch 01 and 02 consolidate a small amount of code in the different
  fib_rules users.

- Patch 03 decouples fib_rules family values from real address families
  to allow using them in code that is not a seperate address family without
  increasing AF_MAX/NPROTO.

- Patch 04 moves the raw_sock/raw_sk() definitions from icmp.h to raw.h
  since they will also be used by ipmr in a following patch.

- Patch 05-08 contain some preparatory work and cleanup for supporting
  multiple multicast routing instances.

- Patch 09 contains the actual changes to support multiple multicast
  routing instances.

These patches have been tested using pimd by myself and using xorp by
Ben Greear.

Comments welcome.

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