vircgroup: Remove virCgroupAddTaskController
vircgroup: Remove virCgroupAddTaskController

There is no need for this function, both of the checks are done
later by virCgroupGetControllerPath.

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

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