Oc 9596 Succesfully run the integration tests on jenkins for knife-openstack(based on knife-cloud)

Added Integration tests for image-os-type, delete-server-on-failure, chef-node-name-prefix, chef-data options and chef-node-attribute options.
PBI ref: https://tickets.corp.opscode.com/browse/OC-9596
@muktaa Please review changes. Thank You.