CBPS-247: Add KV rebalance tests with 1B items
CBPS-247: Add KV rebalance tests with 1B items

Change-Id: Ifdf0e69dadd559af77775ccdf00b29262c7f2520
Reviewed-on: http://review.couchbase.org/71304
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>

couchbase/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner