Description of problem:
Roles allow Hostgroups to be added as a member.
But when listing details of the Hostgroup, there is no tab to indicate what
role this hostgroup is a member of.
Users, Groups, and Hosts have this tab.

Version-Release number of selected component (if applicable):
ipa-server-2.2.0-8.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. Add a Hostgroup, and a Role
2. Edit this Role, and add the hostgroup as its member
3. Edit the Hostgroup

Actual results:
No tab to indicate what Role this hostgroup is a member of.

Expected results:
A tab to indicate what Role this hostgroup is a member of.

Additional info: