Implement barbican memcache security strategy

Provides an option to authenticate and optionally encrtypt the token
data stored in the cache:
memcache_security_strategy = MAC/ENCRTYPT
memcache_secret_key = secret_key

Change-Id: Ia16c8b3d9e3089d9add49e641af0f6668fc7d87f
Related-Prod: PROD-22099
diff --git a/tests/pillar/control_cluster.sls b/tests/pillar/control_cluster.sls
index ea8494e..45af5ad 100644
--- a/tests/pillar/control_cluster.sls
+++ b/tests/pillar/control_cluster.sls
@@ -85,6 +85,10 @@
         port: 11211
       - host: 10.10.10.12
         port: 11211
+      security:
+        enabled: true
+        strategy: ENCRYPT
+        secret_key: secret
     logging:
       log_appender: false
       log_handlers: