Backport Uyuni support?

[stdevel]

Maybe it would be a good idea to backport the Uyuni and SUSE Manager support?

For this, the following things would need to be done:

• replace API calls in maintenance.py, parameters.py, populate.py and snapshot.py with more generic functions (e.g. get hosts, get packages,...) and add optional server type (Uyuni) in order to make katprep more modular
• replace API calls in ForemanAPIClient.py with nailgun (see also issue Use nailgun rather than ForemanAPIClient #134)
• implement UyuniAPIClient.py
• implement unit tests and Uyuni vagrant boxes

It's a moderate code change but would also enable using two popular utilities. satprep (which was designed for these tools) is really outdated and updating it might take more effort..

Open questions

• How to deal with unsupported filtering options? (Spacewalk does not support locations and environments)
  • throw UnsupportedFilterException
• SpacewalkAPIClient.py would need a function which combines multiple calls in a JSON result (combining errata information as well as custom variables, etc.) in order to enable reports
• depends on issue Avoid using Puppet host parameters #110

[stdevel]

Development started in branch feature-spacewalk-support - first draft with API login and verification pushed with commit f41e7bb.