Add v3scopedsaml entry to the setup.cfg.
Add v3scopedsaml entry to the setup.cfg.

Since Patch https://review.openstack.org/#/c/107231/ was abandoned and
entry ``v3unscopedsaml`` stays in the setup.cfg, there should
also some room for v3scopedsaml entry which lets users scope their
unscoped tokens.

Change-Id: Ie42206c323d287b905b4c5da9c790e544a8b8433
alexpilotti/python-keystoneclient,sdpp/python-keystoneclient,sdpp/python-keystoneclient,klmitch/python-keystoneclient,alexpilotti/python-keystoneclient,ging/python-keystoneclient,magic0704/python-keystoneclient,magic0704/python-keystoneclient,darren-wang/ksc,Mercador/python-keystoneclient,darren-wang/ksc,klmitch/python-keystoneclient,Mercador/python-keystoneclient,ging/python-keystoneclient