First part of fix for issue #3896 - Unknown column 'default_mailserver' in ...

Till Brehm

2016-06-16 ffedcb9a80e8a3ff375993fc349d9ce969a1a4d7

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ALTER TABLE `shell_user` CHANGE `ssh_rsa` `ssh_rsa` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL;