OC-10524 [knife-cloud openstack integration tests for Windows]

Updated integration tests for windows. 
PBI- https://tickets.corp.opscode.com/browse/OC-10524
Jenkins - http://ci.opscode.us/job/prabhu-win-openstack-integration-tests
@adamedx

Note: Depends on https://github.com/opscode/knife-cloud/pull/44 for knife-cloud