RPM Support

This is a very-nice-to-have item for RHUI and technically a feature gap with Pulp 2

PR #2159 implements the following REST call/behavior at POST /pulp/api/v3/rpm/comps/ :

• file= [required] : full path to a comps.xml file.
• repository= [optional] : rpm_repository_href, a repository to add the resulting comps-Content-units to
• replace= [optional] : boolean, used only if repository= specified. If true, creates a new repo-version in the repository by first removing existing comps-Content from repository.latest_version() and then adding the ones contained in file=.

The pulp_hrefs of all comps-Content found in file= are returned in created_resources, even if they already existed. If repository= is specified, the pulp_href of the new repository-version is also in created_resources. This may change before the PR is merged, however.

Skullman - how does this sound to you? Does it meet your needs? Or do you need the specific comps-Content-units be independently createable (ie, PackageGroup, PackageEnvironment, PackageLangpack, PackageCategory all with their own POST calls?)