Set sqlite threadsafe = 1
Set sqlite threadsafe = 1

Since we'll be doing concurrent reads and writes, we'll need to up the
concurrency guarantees.

Change-Id: I415322b5f477cb575ab635db77b3bcfee207f12a
Reviewed-on: http://review.membase.org/3589
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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