Description of problem:

Using the cli, but specifying the user/pass in the wrong place can lead to a confusing error:

$ katello system list --user=admin --password=admin
error: Missing credentials and unable to authenticate using Kerberos (more in the log file)


When i get this I am confused because i have provided credentials yet it is complaining i have not.  we need a better error message.

Correct syntax with better error about a different arg that is missing:

$katello --user=admin --password=admin system list 
Usage: katello [options]

katello: error: Option --org is required; please see --help



I usually don't think about arg ordering as mattering, but it does in our CLI and we need better communication around that.