Delete ununsed log files

src/freedombone-logging

           sed -i 's|warn_log.*|warn_log off;|g' $filename
           sed -i 's|error_log.*|error_log off;|g' $filename
       done
+      shred -zu /var/log/nginx/*
   fi
   if [ -f /etc/init.d/spamassassin ]; then
       sed -i 's|DOPTIONS="-d --pidfile=$PIDFILE"|DOPTIONS="-s null -d --pidfile=$PIDFILE"|g' /etc/init.d/spamassassin
   if [ -d /etc/prosody ]; then
       sed -i 's|info = "/var/log/prosody/prosody.log";|info = "/dev/null";|g' /etc/prosody/prosody.cfg.lua
       sed -i 's|error = "/var/log/prosody/prosody.err";|error = "/dev/null";|g' /etc/prosody/prosody.cfg.lua
+      shred -zu /var/log/prosody/prosody.log
+      shred -zu /var/log/prosody/prosody.err
   fi
   if [ -d /etc/exim4 ]; then
       sed -i 's|log_selector =.*|log_selector = -all|g' /etc/exim4/conf.d/main/90_exim4-config_log_selector