Add ndebug for testing GSSNegotiate

A dummy utility which establishes a connection and then calls the
RXGK_GSSNegotiate RPC, printing the RPC's output.

Since the server implementation currently is a dummy stub that always
reports success and static data, this utility does not need to attempt
any negotiation either.

Change-Id: I67600a16b9fd3788b77025253b24cf255a33ac4e