Added --directory to `rpm content -t package upload`.

[ggainey]

This finds all *.rpm in the specified directory and arranges for them to be added to the specified --repository as a single repository-version.

closes #994.

Review Checklist:

• [x] An issue is properly linked. [feature and bugfix only]
• [ ] Tests are present or not feasible.
• [x] Commits are split in a logical way (not historically).

[ggainey]

POC - entire approach may not be viable based on expected-user-scenario...