Pattern is commnad-name not command_name.
Delete rubygem-hammer_cli_katello.spec

in favor of Katello/katello-ballpeen housing the spec.

https://github.com/Katello/katello-ballpeen/blob/master/hammer_cli_katello/rubygem-hammer_cli_katello.spec
Merge pull request #121 from bkearney/bkearney/command-name-standardization

Pattern is commnad-name not command_name.