ruby: replaces Time with Cycles in many places

The patch started of with replacing Time with Cycles in the Consumer class.
But to get ruby to compile, the rest of the changes had to be carried out.
Subsequent patches will further this process, till we completely replace
Time with Cycles.

src/mem/protocol/MESI_CMP_directory-L2cache.sm

@@ -34,9 +34,9 @@
 
 machine(L2Cache, "MESI Directory L2 Cache CMP")
  : CacheMemory * L2cacheMemory,
-   int l2_request_latency = 2,  
-   int l2_response_latency = 2,
-   int to_l1_latency = 1
+   Cycles l2_request_latency = 2,
+   Cycles l2_response_latency = 2,
+   Cycles to_l1_latency = 1
 {
   // L2 BANK QUEUES
   // From local bank of L2 cache TO the network