allow gRPC QuerySummarySync, QueryNotificationSync and QueryResultSync to return ServiceException

[hanstrompert]

At the moment, the gRPC QuerySummarySync, QueryNotificationSync and QueryResultSync, when processing fails, will raise a python NsiException which results in an GENERIC_INTERNAL_ERROR in PolyNSI. The last mentioned error does contain the information from the NSIException, but it is a bit crude, and breaks the NSI specification.

The proper way to implement this is to add a common.ServiceException service_exception field to the QueryConfirmedRequest, QueryNotificationConfirmedRequest and QueryResultConfirmedRequest, which are shared by the synchronous and asynchronous version of the different query requests, and have PolyNSI check for the existence of this field in the Protobuf message, and throw a ServiceException that will send the appropriate SOAP fault to the requester.