hg: jigsaw/jake/jdk: jmod code review comments.

[chris.hegarty at oracle.com]

Changeset: 7e5d2398a250
Author:    chegar
Date:      2016-03-15 20:20 +0000
URL:       http://hg.openjdk.java.net/jigsaw/jake/jdk/rev/7e5d2398a250

jmod code review comments.
1) format describe output similar to -listmods
2) always remove .tmp file
3) disallow classes in the unnamed package
4) remove unused message resources

! src/jdk.jlink/share/classes/jdk/tools/jmod/JmodTask.java
! src/jdk.jlink/share/classes/jdk/tools/jmod/resources/jmod.properties
! test/tools/jlink/JLinkNegativeTest.java
! test/tools/jmod/JmodTest.java