katprep_authconfig: Add host description

[okin]

Is your feature request related to a problem? Please describe.
If you have IPs in your authconfig file listing the hosts might not be as descriptive. Especially with a large list of IPs.
It would be nice if we could add a description to the the hosts in the authconfig.

Describe the solution you'd like
It would be a nice feature to be able to add a description to the hosts in my authconfig.
The description should be shown when running katprep_authconfig list.