On re-handshake, the client should clear the subscribed channels.

[mahesh2080]

When the server asks for a re-handshake, the client should clear its state, including the subscribed channels.

We added a listener for the handshake event, and in OnMessage, we are calling GetChannel('/topic', lastReplyId).Subscribe(). In the event of a re-handshake, GetChannel returns an existing channel from the Channels dictionary with the previously passed replyId and ignores the replyId in the current #call.

After the handshake, it should clear all non-meta channels from the Channels dictionary.

This bug causes this issue:
##27

[mahesh2080]

@kdcllc

Please check this fix and let me know if I can create a pull request:

dev...mahesh2080:master