Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  8593c3c03ef3263f079e95eaccbe4c1917ede0ef

(bug 51876) handle populates sites table interwiki ids correctly

along with cleaning up the code, splitting it out of Utils...

Change-Id: Ie55e2f126ba3c585a3f6719408460a7f3e2221f1