gnu: Update pypi.python.org home pages & use HTTPS.
* gnu/packages/check.scm (python-unittest2, python-pytest-localserver)
(python-discover)[home-page]: Follow (HTTPS) redirections.
* gnu/packages/fontutils.scm (python2-defcon)[home-page]: Likewise.
* gnu/packages/glib.scm (python2-pygobject-2)[home-page]: Likewise.
* gnu/packages/graph.scm (python-igraph)[home-page]: Likewise.
* gnu/packages/graphviz.scm (xdot)[home-page]: Likewise.
* gnu/packages/pdf.scm (python-poppler-qt5)[home-page]: Likewise.
* gnu/packages/python-web.scm (python-zope-event, python-zope-testing)
(python-zope-testrunner, python-zope-i18nmessageid, python-zope-schema)
(python-zope-configuration, python-zope-proxy, python-zope-location)
(python-zope-security))[home-page]: Likewise.
* gnu/packages/python-xyz.scm (python-setuptools,python-six)
(python2-dogtail, python2-enum, python-enum34, python-unidecode)
(python-numpydoc, python-decorator, python-drmaa, python-pathlib2)
(python-ly, python-msgpack, python-termcolor, python-colorama)
(python-pluggy, python2-pathlib2, python-rfc3987)[home-page]: Likewise.
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