CBQE-791: Case when cfg.CLUSTER not defined

Change-Id: I6f07ec78173b51dcef6f916d4f0d01774e9783c6
Reviewed-on: http://review.couchbase.org/24843
Reviewed-by: abhinav dangeti <abhinav.dangeti@gmail.com>
Tested-by: abhinav dangeti <abhinav.dangeti@gmail.com>