[TEST] Use parent path for path.shared_data

On our Jenkins instances the ${path.home} and createTempDir() locations
share a different parent, so the custom index locations are not within
the ${path.shared_data} directory. This is a hack to fix it until we can
find a way to unify the createTempDir() and `path.shared_data` settings
inside the tests

dev-tools/src/main/resources/ant/integration-tests.xml

@@ -173,7 +173,7 @@
           <arg value="-Des.discovery.zen.ping.unicast.enabled=@{es.unicast.enabled}"/>
           <arg value="-Des.discovery.zen.ping.unicast.hosts=@{es.unicast.hosts}"/>
           <arg value="-Des.path.repo=@{home}/repo"/>
-          <arg value="-Des.path.shared_data=@{home}/custom"/>
+          <arg value="-Des.path.shared_data=@{home}/../"/>
           <arg value="-Des.discovery.zen.ping.multicast.enabled=false"/>
           <arg value="-Des.script.inline=on"/>
           <arg value="-Des.script.indexed=on"/>