LetsEncrypt-DNS 2.14.0

Added

• First implementation of autorestart feature in a Docker cluster:
  using environment variable DOCKER_CLUSTER_PROVIDER (default: none), the container will use appropriate
  service restart command to restart the service name specified in autorestart-containers=... directive.
  For now, only Swarm is supported: support is triggered using DOCKER_CLUSTER_PROVIDER=swarm.

Modified

• Python libraries uses now the pip option --no-cache-dir to reduce container footprints.
• The autorestart and autocmd directives are now triggered upon certificate renewal as before, but also
  upon first certificate issuance now.