Notify supervisord on config directory change.

[skrivy]

Problematic situation:

class { 'supervisord':
    ...
    config_include       => '/etc/supervisor/conf.d',
    config_include_purge => true,
    ...
}

If we remove any supervisord::program block with this configuration, it's .conf file gets deleted, but supervisord process is not reloaded and removed program remains running.

This patch reconfigures supervisord on the conf directory content change.

[quanghiem]

By notifying supervisord::service, puppet will restart the supervisord service on any config change. This should notify supervisord::reload instead so that puppet issues a supervisorctl reread and update instead to avoid any downtime.

[skrivy]

@quanghiem Feel free to update the PR.

[quanghiem]

@skrivy I don't think people can add commits to your PR.

[ajcurated]

Sorry for the slow reply guys

If @skrivy wants to close this and @quanghiem you want to propose a new PR based on this.