Pass more data into the redirects. (#3388)
Pass more data into the redirects. (#3388)

This will let us force a CNAME in the base-level `foo.rtd.org` redirect case.

Refs #1916
davidfischer/readthedocs.org,rtfd/readthedocs.org,safwanrahman/readthedocs.org,davidfischer/readthedocs.org,davidfischer/readthedocs.org,rtfd/readthedocs.org,davidfischer/readthedocs.org,safwanrahman/readthedocs.org,safwanrahman/readthedocs.org,safwanrahman/readthedocs.org,rtfd/readthedocs.org,rtfd/readthedocs.org