[issue21258] Add __iter__ support for mock_open

[Paul Koning]

Paul Koning added the comment:

I created a fix for this.  This also fixes a second issue in mock_open, which is that readline() raises StopIteration at EOF rather than returning empty strings.  See attached diff.
(Is there a  better procedure for submitting fixes?)

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nosy: +pkoning
Added file: http://bugs.python.org/file35597/mock.diff

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