LDAP hub/Migration from extension LDAPAuthentication/Config conversion

Automatic config conversion
To get you started, you may want to use the command line script

php extensions/LDAPProvider/maintenance/ConvertLdapAuthenticationConfig.php --output /ext/mediawiki/ldapprovider.json

Be aware that your old "LdapAuthentication" configuration ( variables) must still be enabled in your   file so the script can read out the values.