Description of problem:


As a user of Satellite 6, it is difficult for me to figure out which repository needs to be synced based upon Red Hat docs. 

For example, Red Hat docs say to enable 'rhel-7-server-rpms' in order to enable/update RHEL 7 Server. To synchronize RHEL 7 Server x86_64 in Satellite, which repository (and repository set) does this correspond to? 

I can figure out that it is probably the 'Red Hat Enterprise Linux 7 Server (RPMs)' repository set, but for many products, it isn't so straightforward. 

Additionally, it is trial and error. 

This RFE requests:

* exposing the repository label  visually (so on the Red Hat Repositories page, I can see that 'Red Hat Enterprise Linux 7 Server (RPMs)' == rhel-7-server-rpms)
* exposing the repository label via hammer (and by extension the API). This enables me to ideally enable a repository by label alone (as they are unique across products). 

An ideal solution would be where they user can run a command similar to

hammer repository-set enable \
  --organization "$ORG" \
  --basearch='x86_64' \
  --releasever='7Server' \
  --repository-label=rhel-7-server-rpms