message: remove xquic from required interop success
diff: "picoquic": ["client"],
  "quic-go": ["client"],
  "quiche": ["client"],
  - "xquic": ["client"]
  + "xquic": []
  },
  "handshake": {
  "aioquic": ["client"],
  "picoquic": ["client"],
  "quic-go": ["client"],
  "quiche": ["client"],
  - "xquic": ["client"]
  + "xquic": []
  },
  "retry": {
  "aioquic": ["client"],
  "picoquic": ["client"],
  "quic-go": ["client"],
  "quiche": ["client"],
  - "xquic": ["client"]
  + "xquic": []
  },
  "keyupdate": {
  "aioquic": [],
  "picoquic": [],
  "quic-go": ["client"],
  "quiche": ["client"],
  - "xquic": ["client"]
  + "xquic": []
  },
  "handshakecorruption": {
  "aioquic": [],
  "picoquic": ["client"],
  "quic-go": ["client"],
  "quiche": ["client"],
  - "xquic": ["client"]
  + "xquic": []
  },
  "rebind-addr": {
  "aioquic": [],
  