[CentOS] login case sensitivity

[Kenneth Porter]

On 9/6/2017 3:45 AM, ken wrote:
> I think it would also be a disservice to users, for case-insensitive 
> userids is not what they'll find on web sites and web services 
> throughout the rest of the world, even on their own phones. 

I agree with you on other points, but beware of this one. I've 
discovered that game logins, notably Blizzard, are case-insensitive. 
It's quite frustrating. (I also hate websites that reject spaces in 
passwords.) Then there's sites that reject plus signs in email and use 
your email as your account name, which frustrates anti-spam measures and 
attempts to make your account name harder to guess by adding a 
"disposable" address tag (eg. shiva+centoslistexample at sewingwitch.com).

Let savvy users make their credentials harder to guess.