Rearrange command opcodes and message formats in commmand_ids.h
Rearrange command opcodes and message formats in commmand_ids.h

This change simply puts command opcode definitions and their
binary message formats separately in commands_ids.h.

Change-Id: Ib0d38364a2b7d2bbbb37e0f500bba8f2d0df9db1
Reviewed-on: http://review.couchbase.org/13157
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

teligent-ru/ep-engine,owendCB/ep-engine,couchbaselabs/ep-engine,abhinavdangeti/ep-engine,sriganes/ep-engine,hisundar/ep-engine,daverigby/kv_engine,jimwwalker/ep-engine,jimwwalker/ep-engine,owendCB/ep-engine,daverigby/ep-engine,membase/ep-engine,daverigby/ep-engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/ep-engine,couchbase/ep-engine,sriganes/ep-engine,teligent-ru/ep-engine,daverigby/kv_engine,teligent-ru/ep-engine,couchbase/ep-engine,hisundar/ep-engine,owendCB/ep-engine,abhinavdangeti/ep-engine,hisundar/ep-engine,daverigby/ep-engine,sriganes/ep-engine,owendCB/ep-engine,couchbase/ep-engine,couchbaselabs/ep-engine,sriganes/ep-engine,teligent-ru/ep-engine,abhinavdangeti/ep-engine,membase/ep-engine,couchbaselabs/ep-engine,couchbaselabs/ep-engine,abhinavdangeti/ep-engine,hisundar/ep-engine,membase/ep-engine,jimwwalker/ep-engine,couchbaselabs/ep-engine,membase/ep-engine,jimwwalker/ep-engine,couchbase/ep-engine,abhinavdangeti/ep-engine