parametrized token expiration in keystone.conf
diff --git a/metadata/service/server/cluster.yml b/metadata/service/server/cluster.yml
index 89eb9e1..5d1bbc1 100644
--- a/metadata/service/server/cluster.yml
+++ b/metadata/service/server/cluster.yml
@@ -30,7 +30,7 @@
         user: keystone
       tokens:
         engine: cache
-        expiration: 86400
+        expiration: 43200
         location: /etc/keystone/fernet-keys/
       cache:
         engine: memcached