RFR [9] 8172982: tools/jlink/ResourceDuplicateCheckTest.java requires jdk.tools.jlink.plugin to be exported

[Chris Hegarty]

Since the jlink plugin package is no longer exported this test should
add the appropriate @modules tag.

diff -r 5b75946223fb test/tools/jlink/ResourceDuplicateCheckTest.java
--- a/test/tools/jlink/ResourceDuplicateCheckTest.java	Wed Jan 18 13:56:50 2017 +0000
+++ b/test/tools/jlink/ResourceDuplicateCheckTest.java	Wed Jan 18 17:05:11 2017 +0000
@@ -27,6 +27,7 @@
  * @summary Detect duplicated resources in packaged modules
  * @modules jdk.jlink/jdk.tools.jlink.builder
  *          jdk.jlink/jdk.tools.jlink.internal
+ *          jdk.jlink/jdk.tools.jlink.plugin
  * @run build ResourceDuplicateCheckTest
  * @run main ResourceDuplicateCheckTest
  */

-Chris.