Update for deprecation of selectFields() methods

Authored by Anomie on Oct 12 2017, 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: I5d62ad76fdb64a9c6efd228f27e9b5f512f17d5e
Depends-On: Idcfd15568489d9f03a7ba4460e96610d33bc4089