use test attribute as build version
use test attribute as build version

Change-Id: I38f11ed0b1ace16892e99e190f097b021ec6dc8d
Reviewed-on: http://review.couchbase.org/38027
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

pavel-paulau/perfrunner,EricACooper/perfrunner,PaintScratcher/perfrunner,EricACooper/perfrunner,thomas-couchbase/perfrunner,pavel-paulau/perfrunner,dkao-cb/perfrunner,mikewied/perfrunner,couchbase/perfrunner,hsharsha/perfrunner,hsharsha/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,vmx/perfrunner,PaintScratcher/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,EricACooper/perfrunner,dkao-cb/perfrunner,vmx/perfrunner,EricACooper/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,mikewied/perfrunner,couchbase/perfrunner,thomas-couchbase/perfrunner