$docker_command is not taken in account everywhere

[stang]

When $docker_command is explicitly passed to the docker class, it is taken in account only in service.pp.

class {'docker':
    docker_command => 'other-docker-command',
  }

All the other modules seems to always take $docker::params::docker_command rather than $ docker::docker_command. Thereby, the init files and all the other commands call are not correct.