RFR 8169519: JShell: Handle start-up failures and hangs gracefully

[Robert Field]

Updated webrev:

     http://cr.openjdk.java.net/~rfield/8169519v1.webrev/

Change of how localhost determined (thanks, Jan).  Tests not included in 
webrev,

-Robert

On 11/09/16 20:01, Robert Field wrote:
> JShell: Handle start-up failures and hangs gracefully -- specifically --
> Add time-outs so hangs do not lock out users and so fail-over can 
> function.
> Handle failures more gracefully, including cleaning up remote process.
> Fail-fast for better user-experience and better failure handling.
> Surface failure in API.
> Add testing hooks.
> Better failure information.
>
> Bugs:
>
>     8169519: JShell: Handle start-up failures and hangs gracefully
>     https://bugs.openjdk.java.net/browse/JDK-8169519
>
>     8166581: JShell: locks forever if -R options is wrong
>     https://bugs.openjdk.java.net/browse/JDK-8166581
>
> Webrev:
>
>     http://cr.openjdk.java.net/~rfield/8169519v0.webrev/
>
> Specdiff:
>
> http://cr.openjdk.java.net/~rfield/8169519v0.specdiff/overview-summary.html 
>
>
> JShell API:
>
>     http://cr.openjdk.java.net/~rfield/8169519v0.jshellAPI/
>
>
> Thanks,
> Robert
>