use actual time range in plotter
use actual time range in plotter

Change-Id: I2ab7e8d837a2e5545f2f8702ea9ab989644971ac
Reviewed-on: http://review.couchbase.org/25056
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>

couchbase/cbagent,couchbase/cbmonitor,couchbase/cbmonitor,pavel-paulau/cbagent,vmx/cbagent,mikewied/cbagent