Test performance of DefaultConsistentHash

A simple test that creates a bunch of dummy addresses and attempts to locate a key. Need to test how this degrades as more nodes are added to the CH.

The purpose of this is certain applications may need to generate keys such that the key is always mapped to the local node. One approach is to loop this until the random key is mapped by locating the key and checking if the local address is in the server list. Need to see if this is (a) costly, and whether (b) a better mechanism can be provided here.