Review request for 8139508 Debug option does not work in appletviewer

[Alexander Scherbatiy]

Hello,
Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8139508
  webrev: http://cr.openjdk.java.net/~alexsch/8139508/webrev.00

  This is the fix for the appletviewer which can't start the debugger 
with the jake build.

  - jdk.jdi module exports com.sun.tools.example.debug.tty to 
java.desktop module
  - appletviewer is run with -addmods jdk.jdi option
  - sun.applet.Main adds a read edge to the jdk.jdi module

Thanks,
Alexandr.