Add semicolon claim delimiter config in apache2 plugin

By default the oidc apache2 plugin uses
comma, but Keystone expects a semicolon [1,2].

This is necessary when writing multi-valued
data (such as OIDC-groups) for Keystone to consume.

[1] https://opendev.org/openstack/keystone/src/commit/187bcad52219c2c99b572b3d5463dfa7b2128201/keystone/federation/utils.py#L515
[2] https://docs.openstack.org/keystone/latest/admin/federation/mapping_combinations.html#mappings-examples

Closes-bug: #2085727
Change-Id: I179ac68a463866c4efaa7c9259a247bf4dc3b573
(cherry picked from commit 4b38b5e)
(cherry picked from commit 8403c82)
(cherry picked from commit 86f27a4)

Author: Rodrigo Barbieri

templates/apache-openidc-location.conf

@@ -1,5 +1,6 @@
 {# -*- mode: apache -*- #}
 OIDCClaimPrefix "OIDC-"
+OIDCClaimDelimiter ";"
 OIDCResponseType "id_token"
 OIDCScope "openid email profile"