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

[Roger Riggs]

On Tue, 6 Oct 2020 23:08:40 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

> Hi all,
> 
> could you please review this small cleanup which replaces
> `ManagementFactory.getRuntimeMXBean().getName().split("@")[0]` w/ `ProcessHandle.current().pid()` to get current
> process pid?  Thanks,
> -- Igor

All of these changes can call `ProcessHandle.current().toString()` to return pid of the current process.

test/failure_handler/test/sanity/Suicide.java line 36:

> 34:             String osName = System.getProperty("os.name");
> 35:             if (osName.contains("Windows")) {
> 36:                 cmd = "taskkill.exe /F /PID " + pidStr;

This can be simplified to ProcessHandle.current().toString().  It returns the pid of the process as a string.

Explicitly converting it to a string is not necessary.  The "+" concatenation would convert the number to a string.

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Changes requested by rriggs (Reviewer).

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