Updated openstack/openstack
Project: openstack/nova  0a80b65a188a9dea854777c6aaf867c4ba55c91f

Fake driver: remove unused method get_disk_available_least

The method was only used by the libvirt driver and this was
replaced by a local one.

Change-Id: I6d92b071e9b74b8ba19d4157ee60fa9a1b3c74a7