Address a couple strict_optional lines in req/req_install.py.
Address a couple strict_optional lines in req/req_install.py.

sbidoul/pip,pradyunsg/pip,pypa/pip,pfmoore/pip,rouge8/pip,sbidoul/pip,pypa/pip,pradyunsg/pip,pfmoore/pip,rouge8/pip,xavfernandez/pip,rouge8/pip,xavfernandez/pip,xavfernandez/pip