TestConnectionImplementation BadHostname tests fail in branch-1

TestConnectionImplementation.testGetAdminBadHostname and testGetClientBadHostname are consistently failing in branch-1.

This is because they're assuming that the validity of the host is checked immediately upon getting the protobuf service object, when instead the service code purposefully waits until the first service call to check.

I'll revise the tests to make service calls and verify that they return the correct exceptions (ServiceException wrapping an UnknownHostException).