CBQE-1431 sleep 10 seconds after inserts few items into bucket, especially in windows

Change-Id: Id59d9c2b38c2ed7731d634be58a91905cce45d72
Reviewed-on: http://review.couchbase.org/27180
Tested-by: Thuan Nguyen <soccon@gmail.com>
Reviewed-by: Tommie McAfee <tommie@couchbase.com>