CBQE-2303: Add bucket priority tests in Views

Change-Id: I3bf522f35ba926d3092dec9df6cac1b7ecf301a5
Reviewed-on: http://review.couchbase.org/39526
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Meenakshi Goel <meenakshi.goel@globallogic.com>
Tested-by: Meenakshi Goel <meenakshi.goel@globallogic.com>