hg: jigsaw/jake/jdk: Restore system modules jlink plugin to work with hashes attribute

[mandy.chung at oracle.com]

Changeset: ec901a312639
Author:    mchung
Date:      2016-12-12 20:09 -0800
URL:       http://hg.openjdk.java.net/jigsaw/jake/jdk/rev/ec901a312639

Restore system modules jlink plugin to work with hashes attribute

! src/java.base/share/classes/java/lang/module/ModuleFinder.java
! src/java.base/share/classes/jdk/internal/module/ModuleHashes.java
! src/java.base/share/classes/jdk/internal/module/SystemModuleFinder.java
! src/java.base/share/classes/jdk/internal/module/SystemModules.java
! src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/SystemModulesPlugin.java < src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/SystemModuleDescriptorPlugin.java
! src/jdk.jlink/share/classes/module-info.java