don't rebalance single node cluster
don't rebalance single node cluster

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