* fix a race condition.
when multiple call to GetStream happens around the same time, on the
same inputIndex, a race condition will cause this.buffers.Add() to throw
exception.
* add WebSocket server certificate validation support for net 452
* port forwarding bug fix
In StreamDemuxer, if the buffer is created before connection is established, the port bytes are not removed when
the bytes are delivering to the client. Repro code looks like (the key is to call remoteStreams.Start AFTER
GetStream):
var ws = await kubernetesClient.WebSocketNamespacedPodPortForwardAsync (... )
var remoteStreams = new StreamDemuxer(ws);
var stream = remoteStreams.GetStream(0, 0);
remoteStreams.Start();
This change filters out the port bytes which are the 2nd and 3rd bytes sent in all cases.
* incorporate review feedbacks.
add an enum StreamType to StreamDemuxer so it knows whether / how
the data stream should be handled.
* add tests, fix skip bytes scenario for multiple streams
* add more tests for verifying content.
* simplify code a bit
