Vladislav Kuzmin 7fb06e8317 Repair tests coverage utility
Add requirements for coverage utility.
It makes it possible to run `tox -e py27-cover`
and 'cover' directory will generated with
tests coverage report in HTML format.

Change-Id: I38c4197246fab4d0b8ea9ba3c61cc10966a1fc9e
2015-03-19 10:58:51 +03:00
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