Upgrade nodejs to the new LTS

src/freedombone-upgrade

         fi
 
         #rebuild_exim_with_socks
+        nodejs_upgrade
         apt-get -yq -t stretch-backports install certbot
         email_install_tls
         email_disable_chunking

src/freedombone-utils-nodejs

 
 # change these versions at your peril. Things will often crash if you don't
 # have specifically the correct versions
-NODEJS_VERSION='6.11.4'
+NODEJS_VERSION='8.11.1'
 NODEJS_N_VERSION='2.1.7'
-NPM_VERSION='4.0.5'
+NPM_VERSION='5.6.0'
 
 # This file keeps track of the apps needing nodejs
 # so that it can be removed if tere are no apps which need it
         exit 6389252
     fi
     $mesh_install_nodejs_prefix apt-key add /root/node.gpg.key
-    echo "deb https://deb.nodesource.com/node_6.x stretch main" > "$rootdir/etc/apt/sources.list.d/nodesource.list"
-    echo "deb-src https://deb.nodesource.com/node_6.x stretch main" >> "$rootdir/etc/apt/sources.list.d/nodesource.list"
+    echo "deb https://deb.nodesource.com/node_8.x stretch main" > "$rootdir/etc/apt/sources.list.d/nodesource.list"
+    echo "deb-src https://deb.nodesource.com/node_8.x stretch main" >> "$rootdir/etc/apt/sources.list.d/nodesource.list"
 
     $mesh_install_nodejs_prefix apt-mark -q unhold nodejs
     $mesh_install_nodejs_prefix apt-get update
     rm "$rootdir/usr/bin/test_nodejs_install"
 }
 
+function nodejs_upgrade {
+    if [ ! -f /etc/apt/sources.list.d/nodesource.list ]; then
+        return
+    fi
+    if grep -q "node_8.x" /etc/apt/sources.list.d/nodesource.list; then
+        return
+    fi
+    rootdir=
+    mesh_install_nodejs
+}
+
 function remove_nodejs {
     if [ ! "$1" ]; then
         return