Need to migrate data model attribute from repository.feed -> repository.url
repository model has code that looks like => alias_attribute :url, :feed
And the controllers return "url" instead of "feed". This creates an inconsistency between the data model and the controllers. We need to address this by migrating the model from feed => url and change the place in code where "feed" is used.
Fixes #6097,bz1120427 - repository.feed -> repository.url
Migrating a repository data model attribute from feed to url. The word
feed applies to the feed url used by pulp, but in katello UI, CLI and
API we consistently use url for feed. To mitigate this confusion it was
deemed to rename feed to url.