Upgrade dbupgrade to use dbconvert.
Upgrade dbupgrade to use dbconvert.

Change-Id: I034d50f68101a8f28091b784b58d6bccaeb02a39
Reviewed-on: http://review.membase.org/4283
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Tested-by: Dustin Sallings <1c08efb9b3965701be9d700d9a6f481f1ffec3ea@spy.net>

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