ISPN-263 Handle cluster partitions

https://issues.jboss.org/browse/ISPN-263

I added one more commit with some test fixes.
    However thinking about this more I thought of a more important one that this policy doesn't cover.
    Lets say you have numOwners=3 and a cluster of 4 nodes {A, B, C, D}. If you have an even split 
    {A,B} & {C,D} then both clusters would continue operating like nothing happened since numOwners 
    wasn't hit. This obviously shouldn't be allowed though.

+100 great point @wburns , you nailed it.