SUT launch hangs the GUI withi compile error

[eostermueller]

Current behavior:

1. Start the uber jar.
2. make sure the SUT is stopped
3. introduce a compile error into a .jar file downstream from $HOME/.load-test-in-a-box/sutApp
4. click the 'start SUT' checkbox.
5. Wiremock and H2 health meters will turn green, but SUT and glowroot will not. The "System Under Test" launch checkbox will be grayed out with check....and you'll be stuck in this 1/2 started and 1/2 failed state.
6. The only way out of this 1/2 failed state is to manually kill all the 1/2 started processes or manually download and run this PowerShell script on MS-Windows.
   Ideally, you should be able to delete $HOME/.load-test-in-a-box/deleteMeToStopSnail4jSut.txt but that functionality is not working :-(.

Desired behavior

After step 4 above, the system would somehow detect the compile problem and shutdown everything that was 1/2 started and allow the user to use the GUI to try again.....and also display a message to the end user about what happened -- probably using the "Toast" facility.