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

Uwe Merbeth

2016-05-09 f5daecadf5846ff0b2d512e6a1a47f17342fe02b

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ALTER TABLE `directive_snippets` ADD `customer_viewable` ENUM('n','y') NOT NULL DEFAULT 'n' AFTER `snippet`;
ALTER TABLE `web_domain` ADD `directive_snippets_id` int(11) unsigned NOT NULL default '0';