vircgroup: cleanup controllers not managed by systemd on error
vircgroup: cleanup controllers not managed by systemd on error

If virCgroupEnableMissingControllers() fails it could have already
created some directories, we should clean it up as well.

Reviewed-by: Fabiano Fidêncio <2931bae082ef9bc04523ba759c03a4778316d48f@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>
Signed-off-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>

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