Unregister kernel_safe_sup and net_sup

Force inet_gethost_native to run without supervisor
(Icky fallback)
Add --app-controller option

This options instructs Concuerror to start its own
instrumented application controller.
Remove preemption point from port commands
When stopping Concuerror, wait for process to exit
Treat shutdown exit status as normal
Check ets tab names and rename ac_tab
Fix a bug in instrumenter