bug#25067: #25067 Emacs pretest 25.1.91 - ipython completion

[Edward Flanigan]

Python 3.5.2 |Anaconda 4.2.0 (64-bit)| (default, Jul  2 2016, 17:53:06)
IPython 5.1.0 -- An enhanced Interactive Python.

Recipe is the following:

emacs -q

eval-region on this:

(setq
 python-shell-interpreter "ipython3"
 python-shell-interpreter-args "--simple-prompt --pprint")

Then open *Python* which will be ipython 5.1.0

The following don't work anymore in the pre-test

1.) import num [TAB]  shows possible completions in 25.1.1 but doesn't in the pretest

2.) run afile [TAB] shows possible completions for the files in the directory that match afile*

3.) cd adirec [TAB] shows possible completions