Updated openstack/openstack
Project: openstack/nova  c4fe303ad740793a432f0dd6bc030e6c1d7379ae

Small grammar fix in libvirt/driver.py. fix all occurrences.

Change wording to be more descriptive/correct for greenthread.sleep()
Change-Id: I074391eaa7cfd580b89d89c2dd587796112c4a98