qemu: remove 1.5.2 recipe
xen: remove 4.3.0 recipe to be upstreamed to meta-virtualization.
linux-yocto: remove xen configs/patches in favor of soon to be upstreamed support in meta-virtualization / linux-yocto.
oe-hype.conf: add opengl to distro features to support building xen.
hype-rootfs: build from xen-image-minimal