hg: jigsaw/jake/jdk: Enable jlink gen-installed-modules plugin by default

[mandy.chung at oracle.com]

Changeset: 3f859f4a29bf
Author:    mchung
Date:      2015-11-07 13:02 -0800
URL:       http://hg.openjdk.java.net/jigsaw/jake/jdk/rev/3f859f4a29bf

Enable jlink gen-installed-modules plugin by default

! src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/InstalledModuleDescriptorPlugin.java
! src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/InstalledModuleDescriptorProvider.java