Interface bandwidth utilization display

[jonstout]

Update endpoint display modal to only display bandwidth utilization on cloud interconnects. All other interfaces should be ignored.

[jonstout]

All interfaces have a cloud_interconnect_type parameter which is empty when not configured as a cloud interconnect. When this is empty hide bandwidth related info in the endpoint selection modal: https://github.com/GlobalNOC/OESS/blob/master/frontend/www/js_templates/l2/endpoint_selection_modal.js#L332-L343