vendor: initial vendor

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor/github.com/docker/compose-on-kubernetes/api/compose/clone/slices.go

@@ -0,0 +1,11 @@
+package clone
+
+// SliceOfString deep copy a slice of strings
+func SliceOfString(source []string) []string {
+	if source == nil {
+		return nil
+	}
+	res := make([]string, len(source))
+	copy(res, source)
+	return res
+}