gnu: Move more packages from python to python-web.

gnu: Move more packages from python to python-web.

* gnu/packages/python.scm (python-requests, python2-requests)
(python-requests-2.7, python-oauthlib, python2-oauthlib)
(python-furl, python2-furl, python-wsgi-intercept)
(python-publicsuffix, python2-publicsuffix)
(python-publicsuffix2, python2-publicsuffix2): Move to...
* gnu/packages/python-web.scm: ... here.
* gnu/packages/bioinformatics.scm, gnu/packages/finance.scm:
gnu/packages/maths.scm, gnu/packages/terminals.scm,
gnu/packages/video.scm, gnu/packages/virtualization.scm: Adjust
accordingly.