add legacy cloud providers unit tests to [make test]

Author: khenidak

hack/make-rules/test.sh

@@ -98,6 +98,10 @@ kube::test::find_dirs() {
 
     find ./staging/src/k8s.io/cli-runtime -name '*_test.go' \
       -name '*_test.go' -print0 | xargs -0n1 dirname | sed 's|^\./staging/src/|./vendor/|' | LC_ALL=C sort -u
+
+    # add legacy cloud providers tests 
+    find ./staging/src/k8s.io/legacy-cloud-providers -name '*_test.go' \
+      -name '*_test.go' -print0 | xargs -0n1 dirname | sed 's|^\./staging/src/|./vendor/|' | LC_ALL=C sort -u
   )
 }