Fix bashism

priv/templates/simplenode.runner

@@ -52,7 +52,7 @@ case "$1" in
     start)
         # Make sure there is not already a node running
         RES=`$NODETOOL ping`
-        if [ "$RES" == "pong" ]; then
+        if [ "$RES" = "pong" ]; then
             echo "Node is already running!"
             exit 1
         fi