You don't need to run the s2-init-openid
in the 2.0 version of the plugin, and it has been removed. The files that were copied to your application are now included in the plugin itself.
Just run s2-quickstart
then s2-create-openid
, and s2-create-persistent-token
if you want to support remember-me. This is all described in the docs, which are not available right now due to Github issues but should be online again soon.