RFR (M) 8210593: Clean up JNI_ENV_ARG and factorize the macros for vmTestbase/jvmti[N-R] tests

[JC Beyler]

Hi all,

I am continuing the clean up of the testbase with the next batch, I know
this is getting repetitive but bear with me please.

Here is another one with 50 file changes and ~1000 line changes.

Webrev: http://cr.openjdk.java.net/~jcbeyler/8210593/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8210593

This passes testing for the changed tests on my dev machine.

Thanks for your reviews,
Jc
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