Description of problem:
If VMware is setup to use folder to organize ESX hosts, the folder list is shown to the user during the VM provisioning. If the user selects one of those host folder, provisoining will fail.

Version-Release number of selected component (if applicable):
tested on 5.6, probably other versions too

How reproducible:
always

Steps to Reproduce:
1. make sure vCenter has ESX hosts organized in folders
2. order a new VM from "Lifecycle, Provision VM"
3. in the environment select the Host folders are shown in the dropdown list

Actual results:
if a user selects a host folder, provisioning will fail

Expected results:
the host folders should not be shown in the UI