gnu: Remove python-pytest@2.
* gnu/packages/python.scm (python-pytest): Update to 3.0.7.
[source]: Move substitution to ...
[arguments]: ... here. Incorporate phase from pytest-3.0.
[native-inputs]: Add PYTHON-HYPOTHESIS.
(python-pytest-3.0): Remove variable.
(python2-pytest-3.0): Rename to ...
(python2-pytest): ... this.
[native-inputs]: Add PYTHON2-ENUM34.
* gnu/packages/backup.scm (borg)[native-inputs]: Replace PYTHON-PYTEST-3.0
with PYTHON-PYTEST.
* gnu/packages/calendar.scm (khal): Likewise.
* gnu/packages/databases.scm (python-orator): Likewise.
* gnu/packages/python.scm (python-sphinx-1.6, python-sphinx-1.5.3,
python-pexpect, python-cryptography, python-pyopenssl, python-pytest-warnings,
python-pytest-capturelog, python-pytest-catchlog, python-marshmallow,
python-apispec, python-flasgger, python-pyjwt, python-grako,
python-honcho): Likewise.
* gnu/packages/web.scm (python-internetarchive): Likewise.
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