traffic_replay: logger was ignoring smb.conf log-level

traffic_replay: logger was ignoring smb.conf log-level

We were trying to access the debug-level (in python C bindings) before
the smb.conf had been loaded and actually set the debug-level. So it
would default to zero, regardless of what was in the smb.conf.

Signed-off-by: Tim Beale <timbeale@catalyst.net.nz>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>