Retain logging for tor so that we can monitor its health

src/freedombone-image-customise

     chroot "$rootdir" apt-get -yq -t stretch-backports install tor
     chroot "$rootdir" apt-get -yq install connect-proxy
     chroot "$rootdir" connect-proxy
-    sed -i 's|#Log notice file.*|Log notice file /dev/null|g' "$rootdir/etc/tor/torrc"
-    sed -i 's|Log notice file.*|Log notice file /dev/null|g' "$rootdir/etc/tor/torrc"
+    sed -i 's|#Log notice file.*|Log notice file /var/log/tor/notices.log|g' "$rootdir/etc/tor/torrc"
+    sed -i 's|Log notice file.*|Log notice file /var/log/tor/notices.log|g' "$rootdir/etc/tor/torrc"
     sed -i "s|#AccountingMax.*|AccountingMax $TOR_MAX_TRAFFIC_PER_MONTH_GB GBytes|g" "$rootdir/etc/tor/torrc"
     sed -i "s|AccountingMax.*|AccountingMax $TOR_MAX_TRAFFIC_PER_MONTH_GB GBytes|g" "$rootdir/etc/tor/torrc"
     if ! grep -q 'Host *.onion' "$rootdir/root/.ssh/config"; then

src/freedombone-utils-onion

         echo '%include /etc/torrc.d' >> /etc/tor/torrc
     fi
 
-    echo 'Log notice file /dev/null' > /etc/torrc.d/logging
+    echo 'Log notice file /var/log/tor/notices.log' > /etc/torrc.d/logging
     echo "AccountingMax $TOR_MAX_TRAFFIC_PER_MONTH_GB GBytes" > /etc/torrc.d/maxtraffic
 
     mark_completed "${FUNCNAME[0]}"