Add redis password parameter

Redis server API is not protected with a password
by default.
To fix this issue we need to provide a way to
configure redis with authentification in salt-formula.
This patch addresses the problem for redis used
by contrail analytics.

Co-Authored-By Inessa Vasilevskaya <ivasilevskaya@mirantis.com>

Change-Id: Ia927d5995c2d223b81ed3f3d2a9b389d0a1f021b
Related-Prod: PROD-22096
diff --git a/metadata/service/control/single.yml b/metadata/service/control/single.yml
index f17d610..42181a4 100644
--- a/metadata/service/control/single.yml
+++ b/metadata/service/control/single.yml
@@ -10,6 +10,7 @@
     keystone_admin_password: 'none'
     keystone_service_token: 'none'
     openstack_region: RegionOne
+    redis_password: 'none'
   opencontrail:
     common:
       version: ${_param:opencontrail_version}
@@ -141,6 +142,7 @@
         engine: redis
         host: ${_param:single_address}
         port: 6379
+        password: ${_param:redis_password}
       members:
       - host: ${_param:single_address}
         id: 1