Move k/test/integration/federation to k/federation/test/integration

hack/make-rules/test.sh

@@ -61,6 +61,7 @@ kube::test::find_dirs() {
           -o -path './third_party/*' \
           -o -path './staging/*' \
           -o -path './vendor/*' \
+          -o -path './federation/test/*' \
         \) -prune \
       \) -name '*_test.go' -print0 | xargs -0n1 dirname | sed "s|^\./|${KUBE_GO_PACKAGE}/|" | LC_ALL=C sort -u