allow underscore in ALIAS name (Fixes: #3866)

Florian Schaal

2016-04-30 8beb039f0b7d23b03f7963c3a56c8dde65af3b6b

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