Make update-generated-*.sh not hack around with docker images

make-generated-{protobuf,runtime}.sh was doing some really nasty stuff with how
the build container was managed in order to copy results out.  Since we have
more flexibility to grab results out of the build container, we can now avoid
all of this.  Ideally we wouldn't have `hack` calling `build` at all, but we
aren't there yet.

build/common.sh

@@ -717,6 +717,8 @@ function kube::build::copy_output() {
     --filter='- /_temp/' \
     --filter='+ /_output/dockerized/bin/**' \
     --filter='+ zz_generated.*' \
+    --filter='+ generated.proto' \
+    --filter='+ *.pb.go' \
     --filter='+ */' \
     --filter='- /**' \
     "rsync://k8s@${KUBE_RSYNC_ADDR}/k8s/" "${KUBE_ROOT}"