Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1468541

Description of problem:
Satellite is not allowing the recreation of SSH key after deleting that SSH key once from satellite.
It throws an error notification of 'Fingerprint has already been taken'.

Version-Release number of selected component (if applicable):
Satellite 6.3.0 Snap 5 / Foreman 1.15

How reproducible:
Always

Steps to Reproduce:
1. Create SSH key in any users(i tried in Admin) template
2. Delete that SSH key from users template.
3. Attempt to add same SSH key is same user template.

Actual results:
1. Satellite UI throws error notification - Fingerprint has already been taken.
2. SSH key is not added to user template.

Expected results:
Recreation/Re-Addition of SSH key in user template should be successful for any number of times. Error notification should not be displayed for recreation of SSH key.

Additional info:

The problem is that we enforce uniqueness throughout the application, if user A has the key, user B can't add it to his profile. I think we should run the validation only within owner scope.