Merge branch 'rsync-ssh-multiplex' into 'master'

__rsync: Use $__remote_exec and thus the ssh multiplexing

See merge request ungleich-public/cdist!1001

cdist/conf/type/__rsync/gencode-local

@@ -34,6 +34,8 @@ if [ -f "$__object/parameter/rsync-opts" ]; then
     done < "$__object/parameter/rsync-opts"
 fi
 
+# shellcheck disable=SC2086
 echo rsync -a \
     --no-owner --no-group \
+    -e \"${__remote_exec}\" \
     -q "$@" "${source}/" "${remote_user}@${__target_host}:${destination}"