Convert SendGrid Stats Viewer to use mysqli library, since the older mysql library has been removed from PHP7.  fixes #11286
Convert SendGrid Stats Viewer to use mysqli library, since the older mysql library has been removed from PHP7.  fixes #11286

nysenate/SendgridStatsAccumulator,nysenate/SendgridStatsAccumulator,nysenate/SendgridStatsAccumulator,nysenate/SendgridStatsAccumulator