CBQE-1220 Refactor warmup tests with access logs available

Will submit another patch about manipulating the access log

Change-Id: I98cc9d971ee16e427c52ed3e962d503c7fcaeb7a
Reviewed-on: http://review.couchbase.org/26020
Reviewed-by: Chisheng Hong <chisheng@couchbase.com>
Tested-by: Chisheng Hong <chisheng@couchbase.com>