Remove commented out code.

Samba36 is gone for good.  There is no going back.
For the moment get rid of the panic handler in samba.

In at least half of the cases we've seen the panic handler is smashing
the backtrace and making it harder to see what went wrong.

This change is an attempt to get a cleaner core file which will
help us narrow down the issue.

Ticket: #4285