Change QUIC agent port configuration from a range to a value.

QUIC agent always uses the minimal port number configured. So the range
actually is not respected.

Author: jianjunz

source/agent/quic/agent.toml

@@ -52,5 +52,4 @@ minport = 0 #default: 0
 keystorePath = "./cert/certificate.pfx"
 
 # Port of QUIC agent is going to listen on. Default port for WebTransport is not defined in WebTransport spec. We will update it when it's defined.
-minport = 7700 #default: 7700
-# maxport = 7799 #default: 7799
+port = 7700 #default: 7700

source/agent/quic/index.js

@@ -43,7 +43,7 @@ module.exports = function (rpcClient, selfRpcId, parentRpcId, clusterWorkerIP) {
     };
 
     const quicTransportServer =
-        new QuicTransportServer(addon, global.config.quic.minport);
+        new QuicTransportServer(addon, global.config.quic.port);
     quicTransportServer.start();
     quicTransportServer.on('streamadded', (stream) => {
         const conn = connections.getConnection(stream.contentSessionId);