Description of problem: when a null repo id is given (--repo-id=) some commands present a validation error to the users, but other commands print the command options again with the message that --repo-id is required and was not specified.


Version-Release number of selected component (if applicable):
[jeremy@jcline ~]$ rpm -q pulp-rpm-admin-extensions 
pulp-rpm-admin-extensions-2.2.0-0.4.beta.fc18.noarch


How reproducible: always


Steps to Reproduce:
1. use '--repo-id=' on any command in the rpm repo content, copy, and remove sections (in the case of copy it's --from-repo-id and --to-repo-id).
2. compare to using '--repo-id=' in the rpm repo update, delete, export, sync, and uploads sections.

Actual results:
[jeremy@jcline ~]$ pulp-admin rpm repo remove rpm --repo-id=
Command: rpm
Description: remove RPMs from a repository

Available Arguments:

*snipped*

The following options are required but were not specified:
  --repo-id

[jeremy@jcline ~]$ pulp-admin rpm repo uploads rpm --repo-id=
Validation failed for argument [--repo-id]: value must contain only letters,
numbers, underscores, periods and hyphens



Expected results: A consistent error throughout the commands.


Additional info: