move example blacklist_helo list to docs/ with instructions to install

Jesse Norell

2016-02-08 8c8acac7bb7160e3833b9351bccb8d9c643bddf6

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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';