RFR: 8254102: use ProcessHandle::pid instead of ManagementFactory::getRuntimeMXBean to get pid in tests [v2]

[Igor Ignatyev]

On Wed, 7 Oct 2020 18:38:07 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Igor Ignatyev has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - use Long.toString instead of String.valueOf
>>  - remove explicit coversion to String in Suicide.java
>
> Marked as reviewed by rriggs (Reviewer).

Roger, Aleksey, thanks for your reviews.

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PR: https://git.openjdk.java.net/jdk/pull/534