8138906: [TEST_BUG] Test test/script/trusted/JDK-8087292.js intermittently fails.
Reviewed-by: hannesw, mhaupt

8141209: $EXEC should allow streaming
Reviewed-by: sundar

8087292: nashorn should have a "fail-fast" option for scripting, analog to bash "set -e"
Reviewed-by: hannesw, jlaskey, mhaupt