Added basic checkpoint tests to ep_testsuite.cc
Added basic checkpoint tests to ep_testsuite.cc

These tests cover basic checkpoint creation as well as checkpoint
deduplication and collapsing tests.

Conflicts:

	ep_testsuite.cc

Change-Id: I2ff57019afc7f0c078bb7044733dfb27a527a28d
Reviewed-on: http://review.couchbase.org/15475
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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