Review Request: Warnings cleanup in sun.management and its subpackages

[Kurchi Hazra]

>
>>
>> Also, would any additional testing be required before these changes 
>> go in?
>>
>
> Thanks for asking.  I meant to mention it - jdk_lang and 
> jdk_management test targets.  java.lang.management tests are included 
> in the jdk_lang target.  jdk_management includes the sun.management 
> tests and it also includes jmx tests which Kurchi's change didn't 
> touch that area but no harm to run that and make the jprt submission 
> simpler.

Hi Mandy,

    I ran the jdk_land and jdk_management tests from jdk/test folder 
with and without my changes. I get 8 failures. Is this normal?

Thanks,
Kurchi