Override cache-control headers from the pageviews backend
Override cache-control headers from the pageviews backend

It looks like AQS is emitting cache-control headers of its own, which override
the front-end's private cache-control heders. This patch switches the
precedence to override the backend headers.

gwicke/restbase,Pchelolo/restbase,wikimedia/mediawiki-services-restbase,inverno/restbase,wikimedia/restbase,wikimedia/hyperswitch,milimetric/restbase,Pchelolo/restbase,wikimedia/restbase,d00rman/restbase,eevans/restbase,cscott/restbase,cscott/restbase,wikimedia/mediawiki-services-restbase,milimetric/restbase,gwicke/restbase,eevans/restbase,inverno/restbase,d00rman/restbase