Related-Bug: #1388075
    Problem is webpages with scatter charts are crashes in chrome browser version 38,
    1)Network monitoring dashboard page and infra dashboard pages are crashing mostly
    Fix:Disabled the voronoi option for scattercharts which is causing the brower crash.

Change-Id: I3d2d3b85f9ebe8f7555ce128089ce7f34f181e6b