Fix log return disposed obj (#705)

* generator not to dispose stream

* new generated code

* test to cover log stream

gen/KubernetesGenerator/Program.cs

@@ -956,7 +956,7 @@ namespace KubernetesWatchGenerator
                 {
                     fn(null);
                 }
-                else if (type == "stream" && rt == "Stream")
+                else if (type.ToLower() == rt.ToLower())
                 {
                     fn(null);
                 }