- Changes to support back compat:
- Changes to support back compat:

    - Behave old way, if TFS server is TFS2017 RTW or older
        - finish agent request from Agent.Listener
    - else, raise job completed event from Agent.Worker.
- some CR comments

kasubram/vsts-agent,Microsoft/vsts-agent,kasubram/vsts-agent,lkillgore/vsts-agent,Microsoft/vsts-agent,Microsoft/vsts-agent,lkillgore/vsts-agent,lkillgore/vsts-agent,lkillgore/vsts-agent,kasubram/vsts-agent,Microsoft/vsts-agent,kasubram/vsts-agent