Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1195180
Description of problem:
The naming of the full hostgroup is inconsistent in both WebUI and API. In total is has 4 different names for the same value:

API
hosts -> hostgroup_name
hostgroups -> title

WebUI search has:
Hosts -> hostgroup_fullname or hostgroup_title field
Host Groups -> label field

API:

1. curl -K /opt/hoici/etc/sat6/curl-hoici.conf "-HContent-Type: application/json" "-d{\"per_page\":9999}" -XGET https://localhost/api/v2/hostgroups | jq '.results[] | .title' | grep Backup
   "crash/Backup"
   "crash/Backup/BackupTest"

1. curl -K /opt/hoici/etc/sat6/curl-hoici.conf "-HContent-Type: application/json" "-d{\"per_page\":9999}" -XGET https://localhost/api/v2/hosts | jq '.results[].hostgroup_name' | grep Backup
   "crash/Backup/BackupTest"

WebUI search:

Host Groups page:
"label ~ Backup"

Hosts page:
"hostgroup_fullname ~ Backup"
or
"hostgroup_title ~ Backup"

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

How reproducible:

Steps to Reproduce:
1. Create nested hostgroups
2. Add host to hostgroup
3. Query the full hostgroup name/label

Actual results:
Different field names has to be used

Expected results:
Consistent field name. Preferably label as this is also consistent with the Katello part.

Additional info: