Add a newline at the end of etc/ppsi.conf file

Due to a bug in lib/conf.c, the conf file must be ended with a newline char;
if not, the latest line is ignored. The bug will be hopefully solved soon,
in the meantime this simple workaround avoids any problem.
Signed-off-by: Aurelio Colosimo <aurelio@aureliocolosimo.it>