RFR: JDK-8003890: modify test scripts to pass VMOPTIONS

[Mark Sheppard]

test scripts have been updated to invoke the JVM with an env variable TESTVMOPTS
which carries the vm options to be passed when the jvm is invoked in the test.

webrev location:

     http://cr.openjdk.java.net/~chegar/8003890/webrev.00/

regards
Mark