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.
Original oslo.cache change:
https://review.opendev.org/c/openstack/oslo.cache/+/725405
Change-Id: I415cfee6045cd904e9675b97750c5de2f1be55d3
(cherry picked from commit 5a8dc2b752)
(cherry picked from commit a0d1e4650e)
(cherry picked from commit dc725a221a)