Improved dovecot version detection in installer for Fedora and CentOS.

Till Brehm

2014-10-19 b79f6ca284856d5ad1e260540b418b7eb634bc16

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ALTER TABLE  `mail_user` ADD  `autoresponder_subject` VARCHAR(255) NOT NULL DEFAULT 'Out of office reply' AFTER  `autoresponder_end_date`;