Fix temp data cleanup in test_text.py

[brandon-b-miller]

Noticed that when running pytests, cuDF was leaving a temporary file used for a specific test in the testing data folder without removing it. I think our tests mostly write to tmp to avoid this issue.

In switching it to point to tmp I noticed the intended data is not being actually written to the file, instead it was writing the string __repr__ of the generator. I also shrunk the data size by many orders of magnitude, because in the intended case where the data is meant to be truly generated, 30 mil ends up being a little cumbersome and slow.

[galipremsagar]

cc: @cwharris
FYI about size reduction in pytest.

[cwharris]

thanks!

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[galipremsagar]

@gpucibot merge