server: The DIRs VivaldiClientMap now only stores one client per host. So...

server: The DIRs VivaldiClientMap now only stores one client per host. So multiple clients from the same host will overwrite their value on update. But, since they are from the same host, their vivaldi coordinates should be near equal.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3505 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534