vendor.conf: remove unused github.com/golang/glog
vendor.conf: remove unused github.com/golang/glog

Signed-off-by: Giuseppe Scrivano <20002b7b24c75512093a71a58285826d5c504fca@redhat.com>

mtrmac/skopeo,projectatomic/skopeo,mtrmac/skopeo,mtrmac/skopeo,projectatomic/skopeo