Created attachment 1280374 [details]
expected_result

Description of problem:
Datastores tree is missing in "Host & Clusters" tree on group page

Version-Release number of selected component (if applicable):
5.8.0.15

How reproducible:
100%

Steps to Reproduce:
1. Add infra provider with datastore clusters(in my case vsphere 6 nested)
2. Navigate to add new group page
3. Open Hosts & Clusters tab
4. Extent provider tree 

Actual results:
Datastores tree is missing

Expected results:
Datastores tree should be present

Additional info:
The datastores can be seen as child to selected clusters