Fixes Hyper-V unit tests for latest os_win release
Fixes Hyper-V unit tests for latest os_win release

os_win release 0.1.0 causes unit tests to fail, as the wmi
module does not exist. Mocking it will fix the issue.

Change-Id: Iad91cd280e04db0000b58e1194350489b2044506
Closes-Bug: #1533290

sebrandon1/nova,vmturbo/nova,CEG-FYP-OpenStack/scheduler,zhimin711/nova,mikalstill/nova,dims/nova,mikalstill/nova,rajalokan/nova,openstack/nova,hanlind/nova,mahak/nova,vmturbo/nova,openstack/nova,jianghuaw/nova,NeCTAR-RC/nova,cernops/nova,mikalstill/nova,cyx1231st/nova,rajalokan/nova,vmturbo/nova,rajalokan/nova,jianghuaw/nova,klmitch/nova,klmitch/nova,bigswitch/nova,gooddata/openstack-nova,gooddata/openstack-nova,jianghuaw/nova,NeCTAR-RC/nova,mahak/nova,zhimin711/nova,klmitch/nova,Juniper/nova,mahak/nova,jianghuaw/nova,phenoxim/nova,cloudbase/nova,dims/nova,gooddata/openstack-nova,bigswitch/nova,hanlind/nova,alaski/nova,sebrandon1/nova,CEG-FYP-OpenStack/scheduler,klmitch/nova,hanlind/nova,Juniper/nova,rahulunair/nova,phenoxim/nova,openstack/nova,vmturbo/nova,BeyondTheClouds/nova,rahulunair/nova,cernops/nova,Juniper/nova,cyx1231st/nova,rajalokan/nova,gooddata/openstack-nova,cloudbase/nova,cernops/nova,rahulunair/nova,BeyondTheClouds/nova,Juniper/nova,cloudbase/nova,alaski/nova,BeyondTheClouds/nova,sebrandon1/nova