Do not lowercase user names if kerberos is used
Update commentaries
fixed code typo
Merge branch 'jag/squid3.2-only-lcase-for-ladapauth' of github.com:Zentyal/zentyal into squid3.2-only-lcase-for-ladapauth
Merge pull request #1498 from Zentyal/jag/squid3.2-only-lcase-for-ladapauth

 Do not lowercase user names if kerberos is used