CI: Update jenkinsfiles with new Gerrit URLs

The recent upgrade of Gerrit to 2.16 elimiated referencing a
repository in a way the jenkinsfiles were relying on so
the URL references were changed to a more consistent and supported
format.

Change-Id: I2e8e3f213b9a96bb1b27665eca4a9a24bc49820e
(cherry picked from commit 5ce08457)