Mount /etc/openldap inside the keystone container
Mount /etc/openldap inside the keystone container

For configuring high availability for LDAP in keystone one
needs to edit /etc/openldap/ldap.conf. This worked
before control plane was containerised. Mounting the
openldap configuration into the keystone container
restores the previous behavior.

Change-Id: Id0d73a8ab0ddf7bf9e2b76ea14ffc9acff3a0ad3
Closes-Bug: #1923048
Resolves: rhbz#1944466

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates