clean up the conf file overrides to turn off proactive resource

fetching and compressed cache.  the compressed cache was ok but
proactive resource fetching consistently fails system tests in nginx

test/pagespeed_test.conf.template

@@ -34,11 +34,6 @@ http {
   pagespeed AdminPath /pagespeed_admin;
   pagespeed GlobalAdminPath /pagespeed_global_admin;
 
-  # TODO(jefftk): this option currently breaks IPRO after cache flushing.  This
-  # was turned on by default with PSOL r3966 and needs to be fixed there.
-  pagespeed CompressMetadataCache off;
-  pagespeed ProactiveResourceFreshening off;
-
   root "@@SERVER_ROOT@@";
 
   # Block 5a: Decide on Cache-Control header value to use for outgoing