Added auto refresh expired tokens behavior which is configurable per OpenID Connect client

config/schema/openid_connect.schema.yml

@@ -68,6 +68,9 @@ openid_connect.client.plugin.*:
     iss_allowed_domains:
       type: string
       label: 'Domains that are allowed to initiate SSO using ISS'
+    auto_refresh_expired_tokens:
+      type: boolean
+      label: 'Automatically refresh expired tokens'
 
 openid_connect.client.plugin.facebook:
   type: mapping