Use io.open in notebookapp.py to fix #4303 #4349
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Following the discussion at jupyter#4340, in Python 2 we need `io.open` rather than `open` if using a file descriptor rather than a file name.
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Following the discussion at #4340, in Python 2 we need
io.openrather thanopenif using a file descriptor rather than a file name.This is the first commit from #4348; I got confused and asked @slel to make further changes, which weren't useful.