CBQE-0 add priorities to the warmup conf file

Change-Id: I0e267be10c71dda3e2564329d78bf3b2cd930d10
Reviewed-on: http://review.couchbase.org/25786
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>