Capping mock==1.2.0 on Windows
Capping mock==1.2.0 on Windows

Adding mock cap to 1.2.0 on Windows VM as mock 1.3.0 was released on 23 July and might affect the CI stability
costingalan/cinder-ci,costingalan/cinder-ci,rbuzatu90/cinder-ci,rbuzatu90/cinder-ci,cloudbase/cinder-ci,cloudbase/cinder-ci