[Unittest] Multiple META operations
[Unittest] Multiple META operations

This test issues multiple set_with_metas' and del_with_metas'
and ensures that vbucket item count in memory matches with that
on disk.

Change-Id: I685169275955494541ea5303a5fe6f5c218c330a
Reviewed-on: http://review.couchbase.org/49556
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>
Tested-by: abhinav dangeti <d73ef2279de6577f7bf081737ee47554bbb7dc82@couchbase.com>

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