Use $__remote_exec and thus the ssh multiplexing

cdist/conf/type/__rsync/gencode-local

@@ -36,4 +36,5 @@ fi
 
 echo rsync -a \
     --no-owner --no-group \
+    -e "$__remote_exec" \
     -q "$@" "${source}/" "${remote_user}@${__target_host}:${destination}"