Merge pull request #381 from shaitan/pytests

Pytests: on build python binding testing
Merge pull request #382 from shaitan/pytests

Pytests: fixed BuildRequires for pytest in spec.
Merge pull request #383 from shaitan/pytests

Pytests: fixed build on rhel.
Merge branch 'master' of github.com:reverbrain/elliptics into pytests