Revision 1891683

  *) mod_md:
     - Domain names in `<MDomain ...>` can now appear in quoted form.
     - Fixed a failure in ACME challenge selection that aborted further searches
       when the tls-alpn-01 method did not seem to be suitable.
     - Changed the tls-alpn-01 setup to only become unsuitable when none of the
       dns names showed support for a configured 'Protocols ... acme-tls/1'. This
       allows use of tls-alpn-01 for dns names that are not mapped to a VirtualHost.