When registering options, the list_options was not returning the
appropriate options for keystone. This adds those options. Aslo changes
to use a more direct/generic adding of keystone options.
Related to this, a change was required to the service_endpoints module
to generate an auth object used to get a session.
In addition, the zuul gates for py35 were resolving to a non-existent
target. The changes to tox.ini files addresses making it so the unit
test gates are restored to functionality.
This change also uncovered a misconfigured unit test, and corrects that
test.
Change-Id: Ibc1c6c217ac7396390e7a881afbb9ef1c5ab7091
7708ecbe64