Meta server: implement RPC style selection (short / long) with chunk server and client protocol state machines. Move short mode RPC flag into meta request base class, and add this filed to parsers of authenticate, hello, and lookup RPCs [only]. Set client state machine RPC style flag to the first hello, authenticate, or lookup RPC.
Meta server: client state machine's first op, and RPC's short format flags prior to  RPC processing start.
Meta server: implement "short" versions of all RPSs, including chunk server RPCs.