config: Fix 'then' for 'than' typos in messages and some comments.

Also fix a 'delier' for 'deliver', which I only spotted because the line
had a (correct) 'then' on it!

Signed-Off-By: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by:  Jan Friesse <jfriesse@redhat.com>