CBQE-0: add priorities to view queries conf

Change-Id: I8a56fc38c657fb6daf8a83d54699f551732f94e4
Reviewed-on: http://review.couchbase.org/25782
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Deepkaran Salooja <deepkaran.salooja@globallogic.com>