We didn't need to do most of this anyway, we just needed to configure
mysql before we installed the packages in the image. Some of the other
things were half-baked ideas which will come in later changes to add
os-refresh-config and os-config-applier support to the element.
Change-Id: Ib1b66a8b3b70fac10f3f826b1efd414c67f9bfc6