Description of problem:
When refreshing a manifest that updates few subscriptions or repos only (or performs no update at all, even), refreshing triggers updating of pulp importers of _all_ RedHat repos in Default CV and Library. That redundantly slows down manifest refresh.


Version-Release number of selected component (if applicable):
Sat6.5


How reproducible:
100%


Steps to Reproduce:
1. Import a manifest, enable many repos, optionally synchronize them.
2. Refresh the manifest -twice in a row to be sure the 2nd does not update anything.
3. Check dynflow steps of the Manifest Refresh task


Actual results:
3. will show Actions::Pulp::Repository::Refresh steps for each and every RedHat repo enabled


Expected results:
3. to show those steps only for repos that were really affected by the manifest refresh


Additional info:
Particular upstream source code:

https://github.com/Katello/katello/blob/master/app/lib/actions/katello/organization/manifest_refresh.rb#L31-L36

triggers all the tasks Katello::Repository::RefreshRepository that is in fact Actions::Pulp::Repository::Refresh (cf. https://github.com/Katello/katello/blob/master/app/lib/actions/katello/repository/refresh_repository.rb).