Duplicate handling should check if PID is used by another process before killing

[andeero]

When JAU restarts, it should check if the PID it tries to kill actually is the previously managed process or if the PID is now in use by another process.

[totto]

From observation

• JAU restarts
• JAU lookup the PID for its application
• JAU find the PID active
• JAU try to kill the process - fail since the PID is re-used by another process for another user
• JAU give up, and do not start its application => deadlock (as long as the PID is "active" and owned by "others"

Solution? - if unable to kill PID... remove persisted file with PID - restart JAU or retry start application