RFR (S) 8025638: jmap returns 0 instead of 1 when it fails.

[Fredrik Arvidsson]

Hi

Please help me to review the changes below:

Jira case: https://bugs.openjdk.java.net/browse/JDK-8025638 
<https://bugs.openjdk.java.net/browse/JDK-8024423>
Webrev: http://cr.openjdk.java.net/~allwin/farvidss/8025638/webrev.00/ 
<http://cr.openjdk.java.net/%7Eallwin/farvidss/8024423/webrev.00/>

About this change.
A previous change (https://bugs.openjdk.java.net/browse/JDK-8010278) in 
the Tool.java class caused any tool deriving from this base class return 
the wrong value to the caller when failing.
Changes were made to the Tool.java class and to the derived tool 
implementation classes to handle errors/exceptions during execution and 
ensure that the tool returns 1 to the caller if it fails, and 0 if it 
succeeds.

Previously failed Aurora tests have been run using UTE and verified to PASS.

Cheers
/Fredrik
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