WebStyle: fix implementation of req.get_hostname
WebStyle: fix implementation of req.get_hostname

* In the SimulatedModPythonRequest class used to simulate
  a mod_python request object, the implementation of
  the get_hostname method was wrong and causing an
  un handled exception. This is now fixed.

Co-authored-by: Joe Blaylock <68e4e28eee40b6b66fd088a51c9b308e2ad898fc@slac.stanford.edu>

tiborsimko/invenio-base,tiborsimko/invenio-base,inveniosoftware/invenio-base,inveniosoftware/invenio-base