Updated openstack/openstack
Project: openstack/nova  96161561c4d3aaf89dc4c98efc00da0fcffb2af8

libvirt: sanitize use of mocking in test_host.py

Tidy up the test_host.py test suite, so that it uses mock
exclusively instead of stubs. Also annotate test methods
in preference to using nested contexts since it leads to
clearer test methods.

Blueprint: libvirt-driver-class-refactor
Change-Id: Idc536e408b22cadf8b12ec2bd4ed978f1110fd83