Update aodh _data.cache items to enable memcache security

Change-Id: I11e188a109755f8dd675641a27aad0c44a43c76a
diff --git a/aodh/files/queens/aodh.conf.Debian b/aodh/files/queens/aodh.conf.Debian
index 54f23bc..88c50fc 100644
--- a/aodh/files/queens/aodh.conf.Debian
+++ b/aodh/files/queens/aodh.conf.Debian
@@ -257,5 +257,8 @@
 [keystone_authtoken]
 {%- set _data = server.identity %}
 {%- set auth_type = _data.get('auth_type', 'password') %}
+{%- if server.get('cache',{}).members is defined and 'cache' not in _data.keys() %}
+{% do _data.update({'cache': server.cache}) %}
+{%- endif %}
 {%- include "oslo_templates/files/queens/keystonemiddleware/_auth_token.conf" %}
 {%- include "oslo_templates/files/queens/keystoneauth/_type_" + auth_type + ".conf" %}