virt-host-validate: require freezer for LXC
virt-host-validate: require freezer for LXC

Cgroup freezer support for LXC was added in libvirt-0.7.2.

Signed-off-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>

zippy2/libvirt,andreabolognani/libvirt,jfehlig/libvirt,crobinso/libvirt,zippy2/libvirt,eskultety/libvirt,libvirt/libvirt,fabianfreyer/libvirt,olafhering/libvirt,crobinso/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,libvirt/libvirt,eskultety/libvirt,olafhering/libvirt,jardasgit/libvirt,andreabolognani/libvirt,eskultety/libvirt,libvirt/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,olafhering/libvirt,jfehlig/libvirt,crobinso/libvirt,andreabolognani/libvirt,olafhering/libvirt,eskultety/libvirt,nertpinx/libvirt,eskultety/libvirt,jardasgit/libvirt,jfehlig/libvirt,zippy2/libvirt,andreabolognani/libvirt,jardasgit/libvirt,crobinso/libvirt,zippy2/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,jfehlig/libvirt,andreabolognani/libvirt