Changed in the MDS and ControlManager in the CUToolkit. Fix in LIBUVRpcClient
- now the mrs change the way to execute the rpc handler.
- fixed in ControlManager the unit serve state machine.
- LIBUV Rpc Client now work well when it need to send a packed and the server is off line. The actual packet
  is deleted and if new one is present, a new connection will be attempted.

Signed-off-by: Claudio Bisegni <Claudio.Bisegni@lnf.infn.it>