CBQE-0 add delay 5 seconds to check
warmup stats again.

Change-Id: Ifd137cbc8d27eda82e472ede2887583a15cb44d2
Reviewed-on: http://review.couchbase.org/43215
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>