Openstack nova list IP pools

Openstack nova list IP pools
extension api
This may simply be following a pattern from other tests, in which case I'm fine with this, but would it make sense to use the test property [`regions`](https://github.com/jclouds/jclouds/blob/master/apis/openstack-nova/src/test/java/org/jclouds/openstack/nova/v2_0/internal/BaseNovaApiLiveTest.java#L55) here?

That way, users could limit the live test to a specific region if desired.

/cc @zack-shoylev @jdaggett @everett-toews