Display PID of SUT in browser UI

[eostermueller]

Getting to performance data can be painfully slow.....plugging in tools, collecting logs, analyzing graphs.....
To get data quickly, use the command line tools that come with the JDK: jstack, jstat, jcmd, etc....

But to use these you'll need to know the process id (PID) of the SUT (system under test).
The SUT process is com.github.eostermueller.tjp2.PerformanceSandboxApp, and the UI needs to display the PID of this process every time it's restarted.