Added missing licenses to some sh/cs/py files.

Bug: https://github.com/google/flatbuffers/issues/3872
Change-Id: I5d551168e9bc925e867e5e4ddf5d809418fd44eb
Tested: on Linux.

tests/FlatBuffers.Test/FuzzTestData.cs

@@ -1,4 +1,20 @@
-using System;
+/*
+ * Copyright 2016 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
 
 namespace FlatBuffers.Test
 {