Katello should be using host.comment instead of content_host.description
Need to update katello to use host.comment rather than the deprecated content_host.description. We also need to migrate content_host.description to host.comment as part of this fix.
Fixes #14822: use host.comment rather than host.description.
As part of host unification we need to migrate the description field
on content host to use the host comment field. This commit fixes the
UI to use host.comment as well as migrates existing content host
descriptions to the host.comment field.