Implement additional compute resource attributes for RHV provisioning
Description of problem:
RFE BZ#1559006 introduced some extra RHV options for Storage.
e.g.: "Preallocate disk", "Wipe disk after delete", "disk interface"
It is possible that these params can be simply passed as key=value inside cr_attributes, however it would be good to document them (show them in help)
Version-Release number of selected component (if applicable):
6.6.0 snap 14
Steps to Reproduce:
1. navigate to Create new host page, use RHEV compute resource and at virtual machine tab, choose custom template. then observe all the options for "Storage"
2. Try to set these as parameters using hammer