OSD: read-write replication: after having received the authoritative state in...

OSD: read-write replication: after having received the authoritative state in response to a replica reset, an empty response is now returned to keep the local RPC server from blocking due to too many open requests
tests: fixed read-write replication unit test

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@2834 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534