End-to-end test fails when trying to edit a L2VPN with P2MP

[gretelliz]

Testing the following example returns 500: Internal Server Error

        # existing L2VPN -> key

        api_url = SDX_CONTROLLER + '/l2vpn/1.0'
        payload = {
            "name": "VLAN ID 200 at AMPATH, TENET, at SAX", 
            "endpoints": [
                {"port_id": "urn:sdx:port:ampath.net:Ampath3:50", "vlan": "200"},
                {"port_id": "urn:sdx:port:tenet.ac.za:Tenet03:50", "vlan": "200"},
                {"port_id": "urn:sdx:port:sax.net:Sax01:50","vlan": "200"}
            ]
        }
        response = requests.patch(f"{api_url}/{key}", json=payload)

The return code 402 should be obtained
"402: Request not compatible (For instance, when a L2VPN P2MP is requested but only L2VPN P2P is supported)"