Change how port names are created to be back compatible with analogSensorClient

"/rpc:i" suffix is added to the streaming port generating pattern like
/icub/.../analog:o
/icub/.../analog:o/rpc:i

Strong and clean policy of port names will be implements in a further step.
Merge pull request #116 from barbalberto/wrapperPortNames

Change how port names are created to be back compatible with analogSenso...