Pulp supports having multiple RPMs that have the same name-version-release.architecture values.  This is good in a number of cases.  However, we never want to have both the beta-signed and gold-signed copies of an RPM in the same repo at the same time if that repo being published as a Yum repository.  It's undefined and unsupported to have different RPMs with the same NVRA in the same Yum repository.

Please modify the Yum distributor to fail when trying to publish a yum repository if there are multiple RPMs with the same NVRA.

Additionally, please modify the Yum importer to block imports (including copy operations) that would result in a repo having multiple RPMs with the same NVRA.  Perhaps make this configurable for repos that aren't being published for Yum.