iptraf-ng: Update to version 1.2.1

iptraf-ng: Update to version 1.2.1

Update includes several fixes and enhancements.
The full overview of changes are located in here --> https://github.com/iptraf-ng/iptraf-ng/blob/master/CHANGES .

rvnamed has been merged into iptraf-ng. Fix division by zero patch has been merged into new version, patch is not needed anymore. logrotate configuration for iptraf-ng has been included.

Signed-off-by: Erik Kapfer <ummeegge@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>