code clean, fixed the control unit state machine added the connectionFeeder to IODriver with direct io

IODriverDirectIO now use the URLServiceFeeder class for manage the round-robin or fail-over usage of
service associated to the destination url.
Merge pull request #62 in CHSBNDL/chaosframework from feature_directio_with_feeder to development

* commit '225dd423ec5025d591614145ba6a04264b2a11bc':
  code clean, fixed the control unit state machine added the connectionFeeder to IODriver with direct io