Implement cinder memcache security strategy

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

Change-Id: I06dc593e930992291147614d111aa8c34d9f7ee5
Related-Prod: PROD-22099
diff --git a/tests/pillar/volume_single_barbican.sls b/tests/pillar/volume_single_barbican.sls
index e1da081..ff78f89 100644
--- a/tests/pillar/volume_single_barbican.sls
+++ b/tests/pillar/volume_single_barbican.sls
@@ -3,7 +3,7 @@
     enabled: true
     version: ocata
     barbican:
-      enabled: true     
+      enabled: true
     osapi:
       host: 127.0.0.1
     database: