We got ``Assertion failed: bc_ctl.arg_max >= LINE_MAX (xargs.c: main: 500)`` failure
when using ``xargs``. This fix use pure builtins and avoid ``xargs`` all together.
Docker base image for letsencrypt support now better querying of
existing domains registered. This allows a fine grained check for
stopping the 80-port blocking containers when required.
Valentin Lab