hg: jdk9/sandbox/jaxp: 8152527: Relative rewriteSystem with xml:base at group level failed

[chris.hegarty at oracle.com]

Changeset: 1902a5bda18e
Author:    joehw
Date:      2016-04-14 16:36 -0700
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jaxp/rev/1902a5bda18e

8152527: Relative rewriteSystem with xml:base at group level failed
Reviewed-by: lancea

! src/java.xml/share/classes/javax/xml/catalog/GroupEntry.java
! test/javax/xml/jaxp/unittest/catalog/CatalogTest.java
+ test/javax/xml/jaxp/unittest/catalog/rewriteSystem_id.xml