The rationale behind this change is to allow the use of the glance image
signature verification feature.
In order to do so, it is necessary to:
* Add the [barbican] section to `/etc/glance/glance-api.conf` with
keystone endpoint
Change-Id: I1ec0864b0a4ad6381532032830ac4948b74f7771
Closes-Bug: 1811067
10ce2f862b