RFR: 8170832: Add a new launcher environment variable JAVA_OPTIONS

[Henry Jen]

Hi,

Please review the webrev[1] that add support for JAVA_OPTIONS environment 
variable. The bug[2] describes how JAVA_OPTIONS works.

[1] http://cr.openjdk.java.net/~henryjen/jdk9/8170832/4/webrev/
[2] https://bugs.openjdk.java.net/browse/JDK-8170832

Cheers,
Henry