CBQE-0 :: add delay to accodomodate changes due to upr flow control

Change-Id: I5e91ef1c20b1565abffb2b455d5a23678362bc8a
Reviewed-on: http://review.couchbase.org/38384
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>