RFR(S): JDK-8231287: JMap should do a better job of reporting exception it catches

[Chris Plummer]

Hello,

Please review the following:

https://bugs.openjdk.java.net/browse/JDK-8231287
http://cr.openjdk.java.net/~cjplummer/8231287/webrev.00

Basically no longer have jmap consume and hide exceptions that are 
thrown, and have all tools catch and print any exception that is 
propagated to Tools.execute(). The CR contains more details.

Tested with the following:

   :hotspot_serviceability
   :jdk_svc
   :vmTestbase_nsk_jdi
   :vmTestbase_nsk_jvmti
   :vmTestbase_nsk_jdwp
   :vmTestbase_nsk_jdb

thanks,

Chris