Enable oslo.cache library

Add barbican:server:cache metadata

      cache:
        engine: memcached
        expiration_time: 600
        backend_argument:
          memcached_expire_time:
            value: 660

Enable oslo.cache in the barbican.conf file

Change-Id: I2d7c319fe1fb788c9d583f8b17dbf159597dac78
Related-Prod: PROD-26960
diff --git a/metadata/service/server/cluster.yml b/metadata/service/server/cluster.yml
index f1945f9..45a7e83 100644
--- a/metadata/service/server/cluster.yml
+++ b/metadata/service/server/cluster.yml
@@ -60,6 +60,11 @@
         - host: ${_param:openstack_message_queue_node03_address}
           port: 5672
       cache:
+        engine: memcached
+        expiration_time: 600
+        backend_argument:
+          memcached_expire_time:
+            value: 660
         members:
         - host: ${_param:openstack_control_node01_address}
           port: 11211
diff --git a/metadata/service/server/single.yml b/metadata/service/server/single.yml
index a2a73e4..1099077 100644
--- a/metadata/service/server/single.yml
+++ b/metadata/service/server/single.yml
@@ -54,6 +54,11 @@
         password: ${_param:rabbitmq_openstack_password}
         virtual_host: '/openstack'
       cache:
+        engine: memcached
+        expiration_time: 600
+        backend_argument:
+          memcached_expire_time:
+            value: 660
         members:
         - host: ${_param:single_address}
           port: 11211