Since supporting only PY3 (Ussuri) Glance has not been supporting
termination of encrypted connection to the service [0]. The
section was left behind on the configuring doc.
[0] https://docs.openstack.org/releasenotes/glance/ussuri.html#security-issues
Change-Id: I9356bceb914327f526da7b727fa58522ae18856e
Closes-Bug: #1930597
(cherry picked from commit 652780d029)