message: Enable ECN interop test
diff: @@ -243,7 +243,7 @@ impl Interop {
  Some("multiconnect") => true,
  Some("handshakecorruption") => true,
  Some("transfercorruption") => true,
  - Some("ecn") => false,
  + Some("ecn") => true,
  Some("crosstraffic") => true,
  Some("rebind-addr") => true,
  Some("rebind-port") => true,
  