This patch specifies a set of options required to build a TLS context.
The context built from those options can later on be passed to any of
the oslo.cache backends that supports TLS connections.
Depends-on: https://review.opendev.org/774118
Change-Id: I835641d402e6cbd6650efd0d7a1fb16fb361350e
(cherry picked from commit 7ae8aa377e)