CBQE-1220 Add warmup test with expire and delete operation

Change-Id: I71267fc0075fe0a9223a82073419573d4e31028a
Reviewed-on: http://review.couchbase.org/26143
Reviewed-by: Chisheng Hong <chisheng@couchbase.com>
Tested-by: Chisheng Hong <chisheng@couchbase.com>