hg: jdk9/dev/langtools: 8131029: JShell: recover from VMConnection launch failure

[robert.field at oracle.com]

Changeset: 648525d5c647
Author:    rfield
Date:      2016-06-02 14:05 -0700
URL:       http://hg.openjdk.java.net/jdk9/dev/langtools/rev/648525d5c647

8131029: JShell: recover from VMConnection launch failure
Reviewed-by: vromero

! src/jdk.jshell/share/classes/jdk/internal/jshell/jdi/ClassTracker.java
+ src/jdk.jshell/share/classes/jdk/internal/jshell/jdi/FailOverExecutionControl.java
! src/jdk.jshell/share/classes/jdk/internal/jshell/jdi/JDIConnection.java
- src/jdk.jshell/share/classes/jdk/internal/jshell/jdi/JDIEnv.java
! src/jdk.jshell/share/classes/jdk/internal/jshell/jdi/JDIEventHandler.java
! src/jdk.jshell/share/classes/jdk/internal/jshell/jdi/JDIExecutionControl.java
! src/jdk.jshell/share/classes/jdk/jshell/JShell.java
- test/jdk/jshell/ExecutionControlTest.java
+ test/jdk/jshell/ExecutionControlTestBase.java
+ test/jdk/jshell/FailOverExecutionControlTest.java
+ test/jdk/jshell/JDIListeningExecutionControlTest.java
! test/jdk/jshell/ToolBasicTest.java
+ test/jdk/jshell/UserExecutionControlTest.java