Fix changeid for gerrit

Tags: Diffusion

Summary:
In gerrit 2.12 it changes how the changid in the url looks, this patch
fixes this.

Noted by twentyafterfour

<twentyafterfour> looks like gerrit upgrade broke the changeid links in
phabricator... (by changing the url format)

Change-Id: Idd358d9667f0f8c74f6567808cfa6b50c89941f1

Reviewers: demon, hashar, Luke081515, Dzahn, mmodell

Reviewed By: mmodell

Subscribers: jenkins

Differential Revision: https://phabricator.wikimedia.org/D296