Generate a dummy BUILD file in _output/local/go to keep Bazel out of trouble

.gazelcfg.json

@@ -9,5 +9,8 @@
 		"./federation",
 		"./examples"
 	],
+	"SkippedPaths": [
+		"^_.*"
+	],
 	"AddSourcesRules": true
 }

hack/lib/golang.sh

@@ -307,6 +307,12 @@ kube::golang::create_gopath_tree() {
   if [[ ! -e "${go_pkg_dir}" || "$(readlink ${go_pkg_dir})" != "${KUBE_ROOT}" ]]; then
     ln -snf "${KUBE_ROOT}" "${go_pkg_dir}"
   fi
+
+  cat >"${KUBE_GOPATH}/BUILD" <<EOF
+# This dummy BUILD file prevents Bazel from trying to descend through the
+# infinite loop created by the symlink at
+# ${go_pkg_dir}
+EOF
 }
 
 # Ensure the godep tool exists and is a viable version.