[UX1.0] device template push will fail if per-tunnel qos used

[tzarski0]

If user configures a sdwan_cisco_vpn_interface_feature_template resource with "tunnel_qos_mode", but does not specify the "tunnel_bandwidth" explicitly, the template creation will work, but later when pushing this template to a device, it will fail.

This is because when you configure it via UI, if the user specifies "tunnel_qos_mode", but does not specify the "tunnel_bandwidth" explicitly, the API payload contains the following attribute:

            "tunnels-bandwidth":
            {
                "vipObjectType": "object",
                "vipType": "notIgnore",
                "vipValue": 50,
                "vipVariableName": "vpn_if_tunnel_tunnels-bandwidth"
            },

However terraform doesn't add that block at all when tunnel_bandwidth is not set. Ask is to:

• if tunnel_qos_mode is hub and tunnel_bandwidth is set, configure it like we do today
• if tunnel_qos_mode is to hub and tunnel_bandwidth is not set, tf should add the JSON block listed above in the payload