Make global AbuseFilters searchable on Special:AbuseLog

Global AbuseFilters will be searchable using "global-123"
with this. Furthermore this patch fixes the visibility of
global AbuseFilter ids within the API module.

Bug: 51007
Change-Id: Ia6caba5ae3d727b778076ecdba500b4dc1d55b6f
Merge "Make global AbuseFilters searchable on Special:AbuseLog"