Logging for Trust Boundaries.

[vverman]

Presently trust boundaries in the lib are not being logged manner. We should use loggingUtils to log the crucial TB events like so:

 LoggingUtils.logRequest(request, LOGGER_PROVIDER, "Sending request to refresh access token"); 
 response = request.execute(); 
 LoggingUtils.logResponse( 
     response, LOGGER_PROVIDER, "Received response for refresh access token");