Login-validator arbitrary and capricious

[mi]

Using gmg adduser I created an account for myself named "mi". However, when I tried to login using it, I was told, the login-field must be between 3 and 30 characters long.

This is wrong on many levels:
. The authenticator should not be verifying the length of submitted login and password at all. Such checks might be appropriate for a new account-creation, but I was logging-in, not creating account.
. Even if you disagree with the above, gmg adduser should've rejected the name as too short instead.
. Not only is the lower limit of 3 too high -- a family installation can easily have one-letter accounts, the upper limit of 30 is too low as well. Though over 30 is unusual for an account-name, an e-mail address can easily exceed 30 characters.

I was able to login using my e-mail address instead of username, but this needs fixing (along with tests/test_auth.py).

[Christopher Allan Webber]

Yes I don't remember the justification for this restriction. It probably makes no sense.

[jsandoval]

I created a branch named login-validator-5414 for review in this clone url: git@…:jsandovalc/mediagoblin.git

[Boris Bobrov]

thank you, merged!