WIndows 10 CIRCUITPY enumeration issues

@dhalbert

I've had some issues with my CP devices lately.

I have a desktop USB hub, using that at times I can't get a CircuitPython device to enumerate to Windows 10
I have had a good number of issues after upgrading from Mu 1.01 to beta to 1.0.2 getting the serial window to open properly. I cleaned out the unused COM ports in Windows Device Manager as a first try, still issues maybe related to CTRL-D should reset board, but does nothing #1.

Or it could be #2 is due to #1.

Issue logged per request of @dhalbert

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