hg: kulla/dev/langtools: Change notification mechanism to individual registration per Brian's suggestion. Add shutdown regression tests.

[robert.field at oracle.com]

Changeset: 5f134397a674
Author:    rfield
Date:      2015-01-14 09:49 -0800
URL:       http://hg.openjdk.java.net/kulla/dev/langtools/rev/5f134397a674

Change notification mechanism to individual registration per Brian's suggestion.  Add shutdown regression tests.

! repl/src/api/EvaluationState.java
! repl/src/impl/EvaluationStateImpl.java
! repl/src/tool/Repl.java
+ repl/testng/test/ShutdownTest.java