Either Jenkins seems to have made an update where the build strategy
properties have been moved, or this never worked. When generating the
XML using the Jenkins UI, the build strategies appear at the top level.
Prior to this patch, when using jjb, the configuration was completely
ignored, causing some charming build storms.
Breaking change: The legacy github org output is no longer correct.
Change-Id: Idb5bf025f9bcbf9d9588465713ea5a29ff069e6d