ea196b241f
Libvirt tests which execute _get_host_sysinfo_serial_os will fail unless the test host has a valid /etc/machine-id. This change mocks the above function in the libvirt fixture. This requires pulling the tests for this method out of LibvirtConnTestCase, which uses the libvirt fixture. Change-Id: I3c210d77aaefdbb369fba40ed7bdad5e476472a5