Python3 + tornado + pysftp causing exception and deadlock (bugs with asyncio module)

When running pysftp module through a tornado webserver the pysftp deadlocks on Python 3 with mysterious error messages that don't tell you what is going on. It was found after investigating the issue that it was possible to subclass Paramiko Transport class and use the following override on the run method to solve the issue

class myclass(paramiko.Transport):

        def run(self):
                loop = asyncio.new_event_loop()
                asyncio.set_event_loop(loop)                    
                paramiko.Transport.run(self)

To protect people from asyncio issues it is probably a good idea to create a new_event_loop by default. It might be possible to catch the exception and add an additional parameter to Paramiko to make it easy to fix asyncio issues with Paramiko and turn on/off event loop creation.

Start with Paramiko's Transport.run method and reproduce the Python 3 failure in the reported tornado and pysftp setup. Compare the existing behavior with the proposed asyncio event-loop initialization and verify that the exception and deadlock are resolved without obscuring other failures.