[Koha] connecting to zs39

[Mark Alexander]

Excerpts from Solomon mwangi's message of 2017-01-16 06:09:54 -0600:
> question: why does the port need to be greater than 1023?

Ports below 1024 are privileged.  When I tried using port 210 (the usual port
number for Z39.50) I got a "permission denied" error when I restarted Zebra.
The error message was in /var/log/koha/<LIBRARY>/zebra-output.log:

19:03:20-10/01 [fatal] Failed to bind to tcp:@:210 [Permission denied]