(bug 49742) Hook PropertyInfoStore in service reg.

This causes the PropertyInfoStore to be used per default
as a backend to the PropertyDataTypeLookup service.

DEPLOYMENT NOTE:
when deploying this without running update.php,
set $wgWBRepoSettings['usePropertyInfoTable'] resp.
$wgWBClientSettings['usePropertyInfoTable'] to false until
lib/includes/store/sql/wb_property_info.sql was run to create
the necessary table.

Change-Id: I6b3b9fb0f400cca80641a78a28e51d742e01024a
Merge "(bug 49742) Hook PropertyInfoStore in service reg."