Edited terminology for hypervisor support in Compute

The word "type" has a specific application when used in reference to
hypervisor technology. The bulleted list that follows could be
considered a variety of bare metal hypervisors rather than
virtualization standards.

Change-Id: I0bd35b3f18731c5c5b7c7a35abae999cf937acf9
Partial-Bug: #1217503