Revert "Fixes ispconfig/ispconfig3#3943"

A. Täffner

2016-06-14 b8942a6e3ac3786d82d4ab5f1c340028c29e9d62

1
ALTER TABLE `shell_user` CHANGE `ssh_rsa` `ssh_rsa` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL;