Run mcast tests on rump kernel

[Ryota Ozaki <ozaki-r%netbsd.org@localhost>]

Hi,

I'm trying to run mcast tests on rump kernel.

The tests have been longly all failed due to that
they run directly on the host and the host's
network configuration doesn't meet the tests.

I think we should run the tests on a rump kernel
and configure its network so as to satisfy
requirements of them.

Here is a patch to do so:
http://www.netbsd.org/~ozaki-r/run-mcast-tests-on-rump.diff

With the patch, # of failures of the tests are down
to two.

Any comments?

  ozaki-r