Hammer CLI

Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1127572
Description of problem:
Nested hostgroups that have the same name cannot be retrieved on hammer commandline. Specifying the full path/label does not work either:

1. hammer -c /opt/hoici/etc/hammer-hoici.yaml --csv hostgroup list --per-page=9999 | grep Server
   48,Server,"",,,,41/46
   40,Server,"",,,,35/38
2. hammer -c /opt/hoici/etc/hammer-hoici.yaml hostgroup info --name=Server
   Error: hostgroup found more than once
3. hammer -c /opt/hoici/etc/hammer-hoici.yaml hostgroup info --name=prod/Stibo/Server
   Error: hostgroup not found

Secondly the list option does also not include the full path. The Label column is always empty

1. hammer -c /opt/hoici/etc/hammer-hoici.yaml --csv hostgroup list
   Id,Name,Label,Operating System,Environment,Model,Ancestry
   52,crash,"",,,,""
   53,IPS,"",,,,52
   56,CITest,"",,,,52/53
   54,Satellite6,"",,,,52/53
   55,UserTest,"",,,,52/53
   41,dev,"",,,,""

To retrieve the full path

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Create nested hostgroups with duplicate names
2. List hostgroups
3. Info of hostgroup, List/Add puppet classes to hostgroup, etc.

Actual results:

Expected results:
Hostgroup list shall provide Label as unique identifier
All actions on Hostgroups shall allow Label as hostgroup input.

Additional info: