[BUG] lldap website auth's username is case sensitive, while password reset is not

[evrardjp]

Describe the bug
When logging in, I need to provide a username in a case sensitive manner (makes sense to me).
Yet, if I go to password reset page, I add a capital letter for the login to recover, and it will work.

If this is intentional, it can definitely confuse people "Why does the password reset work, but auth does not?"

To Reproduce
Steps to reproduce the behavior:

1. Create user in the web interface in lowercase letters
2. Go for self-service password reset page and enter the same username with an uppercase letter.
3. Receive password reset email
4. (Optional) try authenticate with uppercase user.

Expected behavior
Step 3 should not have worked without the correct case.

Logs
If you want logs I can provide some.

Additional context
Is that expected?

[lordratner]

When you create a user, it is not case sensitive. If you already have user "johndoe" you will not be able to create "JohnDoe"

I think everything should be case-insensitive (for usernames obviously) and force it to lowercase in the webui. Easier that way.