Compatibility hack to ease roll-out of EL API module

This ensures remote schema are fetched using index.php while we roll out the
API module to MetaWiki. See Gerrit change I4f1763372 for details.

Change-Id: I7fc1a5ad4296a86796e0edc2093f7a7286e1e268
Re-enable EventLogging on labs

Change-Id: Ibeb07a4b9bd07088975df66145e601565e68c079
Merge "Compatibility hack to ease roll-out of EL API module"