Test fix - we sometimes have done two bg fetches during the race
Test fix - we sometimes have done two bg fetches during the race

This seems to happen consistently on rh32.  Unclear why other than
perhaps a bad usleep implementation.  Either way, it does not
invalidate the test as long as there was at least one.

Change-Id: I45b9a0463436169e30d1fc6953904a12c29bd590
Reviewed-on: http://review.northscale.com/2408
Tested-by: Dustin Sallings <1c08efb9b3965701be9d700d9a6f481f1ffec3ea@spy.net>
Reviewed-by: Dustin Sallings <1c08efb9b3965701be9d700d9a6f481f1ffec3ea@spy.net>

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