Creation of user account for datserver

src/freedombone-app-datserver

         rm -rf $DATSERVER_DIRECTORY
     fi
     mkdir $DATSERVER_DIRECTORY
-    useradd -d "$DATSERVER_DIRECTORY" -s /bin/false datserver
+    useradd -c "datserver system account" -d "$DATSERVER_DIRECTORY" -m -r -g datserver datserver
     if [ ! -d $DATSERVER_DIRECTORY ]; then
         echo $'dat directory was not created'
         exit 9568356