Add information about protocol, request, and response to NoNameservers exception.

Add information about protocol, request, and response to NoNameservers exception.

Information about UDP/TCP protocol usage is returned from str(NoNameservers) but
request and response variables are intended for application debug logs
and are not returned from str().

str() for parametrized version of the exception now returns string like:
All nameservers failed to answer the query localhost. IN URI: Server 192.0.2.1 TCP port 53 anwered BADVERS; Server 192.0.2.2 UDP port 53 anwered BADVERS