hg: jdk9/hs/jdk: 8172288: Fix Jigsaw related module/package error messages and throw correct exceptions

[harold.seigel at oracle.com]

Changeset: 727e88de35ed
Author:    hseigel
Date:      2017-01-13 10:45 -0500
URL:       http://hg.openjdk.java.net/jdk9/hs/jdk/rev/727e88de35ed

8172288: Fix Jigsaw related module/package error messages and throw correct exceptions
Summary: Reword error messages and throw IllegalStateExceptions where appropriate
Reviewed-by: alanb, acorn, lfoltan, gtriantafill

! src/java.base/share/classes/java/lang/reflect/Layer.java