Replace deprecated org.apache.http.impl.client.DefaultHttpClient [#2956]

dspace-api/src/test/java/org/dspace/content/MetadataFieldNameTest.java

@@ -1,3 +1,10 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
 package org.dspace.content;
 
 import static org.junit.Assert.assertEquals;