detect the ubuntu version based on /etc/os-release

Uwe Merbeth

2016-05-09 f5daecadf5846ff0b2d512e6a1a47f17342fe02b

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ALTER TABLE `web_domain` ADD `seo_redirect` VARCHAR( 255 ) default NULL AFTER `redirect_path`;
ALTER TABLE `web_folder_user` ADD `server_id` INT( 11 ) NOT NULL DEFAULT '0' AFTER `sys_perm_other`;