RefreshToken loop should be run even if user user provides streamUrl

[harshithkashyap]

According to the following snippet here, the refreshTokenLoop function is only run if the streamUrl doesn't exist.

if (this.token && this.streamUrl) {
    this.connectionStatus$.next(ConnectionStatus.Online);
     return Observable.of(connectionStatus);
} else {
     return this.startConversation().do(conversation => {
         this.conversationId = conversation.conversationId;
         this.token = this.secret || conversation.token;
         this.streamUrl = conversation.streamUrl;
         this.referenceGrammarId = conversation.referenceGrammarId;
          if (!this.secret)
               this.refreshTokenLoop();
          this.connectionStatus$.next(ConnectionStatus.Online);
}

This is valid when starting a new conversation but when the user is connecting to an existing conversation, a streamUrl is returned while requesting a directline token.

As of now, we'll need to request a directline token for a conversation on the backend, ignore the streamUrl and only send token and conversationId to directline constructor. This would internally call same URL as that of backend to obtain the streamUrl leading to redundant calls.

GET https://directline.botframework.com/v3/directline/conversations/abc123?watermark=0000a-42

[compulim]

I think what you observe here is correct.

We need to revisit all resume/end/error/expired conversation stories, please track it at #124.

[cwhitten]

see #124 for updates on this workstream