Make the installing of the undercloud vm disk optional, this will enable testing the Live ISO.
Make the installing of the undercloud vm disk optional, this will enable
testing the Live ISO.

eprasad/instack-undercloud,dpkshetty/instack-undercloud,dmsimard/instack-undercloud,dmsimard/instack-undercloud,eprasad/instack-undercloud,bcrochet/instack-undercloud,dpkshetty/instack-undercloud,bcrochet/instack-undercloud,rdo-management/instack-undercloud,agroup/instack-undercloud,rdo-management/instack-undercloud,agroup/instack-undercloud