JDK 9 RFR of JDK-8036842: Remove unneeded/obsolete -source/-target options in javac tests, part 2

[Joe Darcy]

Hello,

Please review the webrev of changes for

     JDK-8036842: Remove unneeded/obsolete -source/-target options in 
javac tests, part 2
     http://cr.openjdk.java.net/~darcy/8036842.0/

The langtools regression tests suite still passes with these changes in 
place.

Thanks,

-Joe