Hammer CLI

Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1122656
Description of problem:
When running "hammer hostgroup list" with nested host groups, it's unclear which groups are children of which others.

The "label" column is blank (it's now "title" in APIv2) and the ancestry column only shows IDs.

Version-Release number of selected component (if applicable):
rubygem-hammer_cli_foreman-0.1.1-1.201407071351git6be75b7.el6.noarch

How reproducible:
Always

Steps to Reproduce:
1. hammer hostgroup create --name test
2. hammer hostgroup create --parent-id 1 --name test2
3. hammer hostgroup create --parent-id 2 --name test3

Actual results:

---|-------|-------|------------------|-------------|-------|---------
ID | NAME  | LABEL | OPERATING SYSTEM | ENVIRONMENT | MODEL | ANCESTRY
---|-------|-------|------------------|-------------|-------|---------
1  | test  |       |                  |             |       |         
2  | test2 |       |                  |             |       | 1       
3  | test3 |       |                  |             |       | 1/2     
---|-------|-------|------------------|-------------|-------|---------

Expected results:

---|-------------|-------|------------------|-------------|-------|
ID | PARENT      | NAME  | OPERATING SYSTEM | ENVIRONMENT | MODEL |
---|-------------|-------|------------------|-------------|-------|
1  |             | test  |                  |             |       |
2  | test/       | test2 |                  |             |       |
3  | test/test2/ | test3 |                  |             |       |
---|-------------|-------|------------------|-------------|-------|

or similar, taking inspiration from the UI. Maybe the separate parent column is superfluous. I've no idea why model is here.

Additional info: