[9] Review request for 8139394: more detailed message for "Could not initialize shell library"

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:
bug: https://bugs.openjdk.java.net/browse/JDK-8139394

webrev: http://cr.openjdk.java.net/~ssadetsky/8139394/webrev.00/

Error message details are enhanced in case of shell folder 
initialization failure.

--Semyon