Use new Python Package Index url, https://pypi.org
Use new Python Package Index url, https://pypi.org

A new version of Python Package Index has been deployed and
pypi.python.org has been deprecated in favor of pypi.org. Although
requests to the former url will get a HTTP 302 redirect, py2dsp
will try to decode HTML as JSON and will break.

This commit updates default values for PYPI_JSON_URL and
PYPI_XMLRPC_URL to the new one.

p1otr/pypi2deb,p1otr/pypi2deb