python: add a whole interface server test class (NB necessary boilerplate is still missing)
python: add a whole interface server test class (NB necessary boilerplate is still missing)

djs55/message-switch-1,djs55/message-switch-1,djs55/message-switch-1,djs55/message-switch,xapi-project/message-switch,xapi-project/message-switch,djs55/message-switch,xapi-project/message-switch,djs55/message-switch