RFR (M) 8210700: Clean up JNI_ENV_ARG and factorize the macros for vmTestbase/jvmti/unit tests

[JC Beyler]

Hi all,

We have arrived to the last webrev for removing the JNI_ENV macros from the
vmTestbase:

Webrev: http://cr.openjdk.java.net/~jcbeyler/8210700/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8210700

Thanks again for the reviews,
Jc
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