Update keystone default softparams

Moves _param:keystone_tokens_expiration: 3600 definition
into defaults/openstack/init.yml

Add default soft params for the keystone fernet rotation:
keystone_fernet_rotate_rsync_minute = 0
keystone_fernet_rotate_rsync_hour = '*'

Add default soft param for the keystone [token] allow_expired_window:
keystone_tokens_allow_expired_window = ''

Adjuststed the max_active_keys default value according to the following defaults:
``[token] allow_expired_window`` = 172800 (48 hours)
``[token] expiration`` = 3600 (1 hour)
  rotation_frequency = 1 hour (keystone_fernet_rotate_rsync_minute/hour = 0 *)

max_active_keys = (allow_expired_window + expiration)/rotation_frequency + 2
keystone_tokens_max_active_keys = 51

Change-Id: I7a2a252afb34de9f3c7c4a1549f67d534959ecf9
Related-Prod: PROD-27591
diff --git a/keystone/server/single.yml b/keystone/server/single.yml
index 6996968..9663488 100644
--- a/keystone/server/single.yml
+++ b/keystone/server/single.yml
@@ -13,7 +13,6 @@
     mysql_admin_user: root
     mysql_admin_password: password
     mysql_keystone_password: password
-    keystone_tokens_expiration: 3600
     openstack_node_role: primary
     keystone_service_protocol: ${_param:cluster_internal_protocol}
   linux:
@@ -57,7 +56,8 @@
       tokens:
         engine: fernet
         expiration: ${_param:keystone_tokens_expiration}
-        max_active_keys: 3
+        max_active_keys: ${_param:keystone_tokens_max_active_keys}
+        allow_expired_window: ${_param:keystone_tokens_allow_expired_window}
         location: /var/lib/keystone/fernet-keys
       credential:
         location: /var/lib/keystone/credential-keys