Updated openstack/openstack
Project: openstack/nova  a6cde2098e9006c3a3631d34d9fe54dfe0d8552b

compute: rename hvtype.py to hv_type.py

For consistency with vm_mode.py, rename the hvtype.py module
to hv_type.py

Change-Id: I70bb6dea0e14ed0904d8d21b41b93b47bf0deb09