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If left undefined, the drupal class will create a vhost file named 50-.conf with an empty ServerName, and httpd will fail to start. Use $::fqdn as a default site_name instead. This will not affect Infra as Infra specifies this value explicitly. Any downstream users must also be specifying this value explicitly for the module to work, so this is a safe change. Change-Id: Ia639f05a4ba7072812a1c4d6bb3a702fce493d02