Converter from Java: do not produce class object for just private methods + fixed bug with unnecessary static member qualification

j2k/tests/testData/ast/issues/doNotQualifyStatic.java

@@ -0,0 +1,10 @@
+//file
+class Outer {
+    public static Object o = new Object();
+
+    public static class Nested {
+        public void foo() {
+            o = null;
+        }
+    }
+}