Added tests for IPv6 to peer grouper tests.
Merge branch 'master' of https://github.com/juju/juju into peergrouper-ipv6-testing
Merge branch 'master' of https://github.com/juju/juju into peergrouper-ipv6-testing
Some simplification after review.
One final missed change.
Merge pull request #281 from TheMue/peergrouper-ipv6-testing

Added testing for IPv6 to peer grouper tests

So far the peer grouper only tests IPv4. As part of the IPv6 enabling the peer grouper testing now runs all tests for IPv6 too.