Update for deprecation of selectFields() methods

Authored by Anomie on Thu, Oct 12, 7:45 PM.

Description

Update for deprecation of selectFields() methods

Various selectFields() methods were deprecated in MediaWiki core change
Idcfd1556, replaced with getQueryInfo() methods.

Change-Id: Ibe82dadb0f2d1c5dbc38b96731c6e443c5469ff0
Depends-On: Idcfd15568489d9f03a7ba4460e96610d33bc4089