Description/Background:

When system was first registered against Satellite server, then Katello yum/dnf plugins are installed. When the system is unregistered from Satellite and then it is registered against hosted candlepin server, then Katello plugins are still enabled and these plugins tries to hit non-existing REST API endpoints on candlepin server. it is useless and it slows down yum/dnf.

https://github.com/Katello/katello-host-tools

Example of REST API call that is not available on hosted candlepin server:

https://github.com/Katello/katello-host-tools/blob/master/src/katello/repos.py#L28

Acceptance Criteria:

• Katello plugins should try to hit REST API endpoints only in the case, when server has such capabilities.
• Each Katello plugin could also try to disable itself, when it is detected that candlepin server is hosted candlepin server or when the related candlepin server does not have required capabilities.

Documentation Acceptance Criteria:

• Document that when unregistering from Satellite, the customer needs to remove  katello-host-tools and katello-tracer.