Previously for correct termination, the PandaController called
the finish-function of the openocd wrapper, invoked a coroutine
switch and waited for the openocd wrapper to finish up and switch
coroutine again, so the PandaController could exit with correct
exitStatus. Now the openocd-wrapper directly exits with chosen
exit status.
Change-Id: I8d318a4143c53340896ccee4d059a0d79fdcfe89
