Ensure that override factory is used
Ensure that override factory is used

Instead of needing to rely on execution of
`bin/zf-mvc-auth-oauth2-override.php`, this patch adds a mergeConfig
listener that overrides the default value to use the
NamedOAuth2ServerFactory from this module.

eoko/zf-mvc-auth,qapa/zf-mvc-auth,SvenRtbg/zf-mvc-auth,stefanotorresi/zf-mvc-auth,jonday-mayden/zf-mvc-auth