libxtreemfs: jni: Extend UUIDResolver and fix getStripeLocationsFromReplicas.

getStripeLocationsFromReplicas has been dependend on a running
"org.xtreemfs.common.uuids.UUIDResolver" Thread. It has been refactored to
depend just on the "org.xtreemfs.common.libxtreemfs.UUIDResolver" interface
which has been extended and implementend in the JNI interface.