keep torrc configuration

src/freedombone-upgrade

         # reinstall tor from backports
         tor_version=$(tor --version)
         if [[ "$tor_version" == *' 0.2'* ]]; then
-            apt-get -yq -t stretch-backports install tor
+            echo 'N' | apt-get -yq -t stretch-backports install tor
         fi
     fi
 fi