Ruby: Add new object called WireBuffer to mimic a Wire.

This is a substitute for MessageBuffers between controllers where you don't
want messages to actually go through the Network, because requests/responses can
always get reordered wrt to one another (even if you turn off Randomization and turn on Ordered)
because you are, after all, going through a network with contention. For systems where you model
multiple controllers that are very tightly coupled and do not actually go through a network,
it is a pain to have to write a coherence protocol to account for mixed up request/response orderings
despite the fact that it's completely unrealistic.  This is *not* meant as a substitute for real
MessageBuffers when messages do in fact go over a network.

src/mem/protocol/RubySlicc_Types.sm

@@ -146,6 +146,10 @@ structure (CacheMemory, external = "yes") {
   void setMRU(Address);
 }
 
+structure (WireBuffer, inport="yes", outport="yes", external = "yes") {
+
+}
+
 structure (MemoryControl, inport="yes", outport="yes", external = "yes") {
 
 }