DumpingDisconnect.Net

Removing handling Disconnect message in the .NET Client as the server no longer sends Disconnect messages.
DumpingDisconnect.JS

Removing handling Disconnect message in the .JS client as the server no longer sends Disconnect messages.
TransportAbortHandlerIsMovingOn - removing transport abort handler
(We wish him luck in /dev/null)

Fixes workitems #3067 and #3102
Update Katana (Microsoft.Owin) dependencies from 2.0.1 to 2.1.0
Prevent MessageBus from hanging forever in the second call to Dispose