[8u] RFR for backport of "JDK-8165736: Error message should be shown when JVMTI agent cannot be attached" to jdk8u-dev

[Shafi Ahmad]

Hi,

Please review the backport of ' JDK-8165736: Error message should be shown when JVMTI agent cannot be attached' to jdk8u-dev.
Please note that this is not a clean backport because we can't not backport native jtreg tests as  infrastructure of naive jtreg test has been available since JDK 9.  

webrev: http://cr.openjdk.java.net/~shshahma/8165736/
jdk10 bug: https://bugs.openjdk.java.net/browse/JDK-8165736
original patch pushed to jdk10: http://hg.openjdk.java.net/jdk/jdk/rev/bc1cffa26561

Test:  Run jprt -testset hotspot, -testset core

Regards,
Shafi