RFR(S/T) : 8243568 : serviceability/logging/TestLogRotation.java uses 'test.java.opts' and not 'test.vm.opts'

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8243568/webrev.00
> 8 lines changed: 0 ins; 6 del; 2 mod; 

Hi all,

could you please review this small and trivial patch which updates serviceability/logging/TestLogRotation.java test to pass both 'test.java.opts' and not 'test.vm.opts' ? to do that, the patch removes the custom logic of handling test.java.opts and just uses ProcessTools.createJavaProcessBuilder(boolean addTestVmAndJavaOptions=true, String...), which prepends values of both properties. 
from JBS:
> serviceability/logging/TestLogRotation.java test use 'test.java.opts' to get external vm flags, yet actually external flags are split b/w 'test.java.opts' and 'test.vm.opts' and in the majority of cases all external flags are set listed in 'test.vm.opts' so the test should be updated to read both.

JBS: https://bugs.openjdk.java.net/browse/JDK-8243568
webrev: http://cr.openjdk.java.net/~iignatyev//8243568/webrev.00

Thanks,
-- Igor