Move ConflictingNamesTest to lib/go/test

Client: go

Also add missing copyright header for files added in
https://github.com/apache/thrift/pull/2307.
diff --git a/lib/go/test/EqualsTest.thrift b/lib/go/test/EqualsTest.thrift
index c699232..57ce131 100644
--- a/lib/go/test/EqualsTest.thrift
+++ b/lib/go/test/EqualsTest.thrift
@@ -1,3 +1,22 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
 typedef i8 mybyte
 typedef string mystr
 typedef binary mybin
@@ -106,4 +125,4 @@
     18: optional map<i64, mybyte> OptInt64MyByteMapFoo,
     19: map<mybyte, i64> MyByteInt64MapFoo,
     20: optional map<mybyte, i64> OptMyByteInt64MapFoo,
-}
\ No newline at end of file
+}