Adding new KycoExceptions.
Adding new KycoExceptions.

* KycoCoreException: For generic exceptions raised on the Controller.
* KycoSwitchOfflineException: Exception used mainly when trying to send
                              data to a switch that is offline

macartur/kytos,diraol/kytos,erickvermot/kytos,kytos/kyco,diraol/kytos,erickvermot/kytos,cemsbr/kytos,renanrodrigo/kytos,cemsbr/kytos,diraol/kytos,erickvermot/kytos,cemsbr/kytos,kytos/kytos