Add option to specify alternate name for config.repo

[simenon]

Is your feature request related to a problem? Please describe.
When generating a .repo file for a repository the file is allways named config.repo.

Describe the solution you'd like
Add an option to specify a (alternate) name for the config.repo

Something like
pulp rpm publication create
--repository "${REPO_NAME}"
--repo-config '{"gpgcheck": 1, "repo-gpgcheck": 1}'
--repo-filename "${REPO_NAME}.repo"

Describe alternatives you've considered
None

Additional context
Generally when people download a .repo file they add it to thier repo directory (/etc/yum.repos.d). If all files are named config.repo then you can not distinguish between different repo's, unless you rename the file.