Review Request: JDK-8173712: Rename JAVA_OPTIONS environment variable to JDK_JAVA_OPTIONS

[Mandy Chung]

Henry, Kumar,

Can you please review this patch:
  http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8173712/webrev.00/

JAVA_OPTIONS was introduced by JDK-8170832 but it turns out that
environment variable name conflicts with existing uses.  It might 
not be uncommon for scripts to set JAVA_OPTIONS. To mitigate the
compatibility concern, we decide to rename JAVA_OPTIONS to 
JDK_JAVA_OPTIONS.  With multi-word name and `JDK_` prefix, that
should reduce the chance of name clash.

thanks
Mandy