additional changes for v1beta15 handling of machine-types
additional changes for v1beta15 handling of machine-types

googlearchive/compute-appengine-demo-suite-python,gdgjodhpur/compute-appengine-demo-suite-python,googlearchive/compute-appengine-demo-suite-python,jonparrott/compute-appengine-demo-suite-python,jonparrott/compute-appengine-demo-suite-python,gdgjodhpur/compute-appengine-demo-suite-python,gdgjodhpur/compute-appengine-demo-suite-python,jonparrott/compute-appengine-demo-suite-python,googlearchive/compute-appengine-demo-suite-python,jonparrott/compute-appengine-demo-suite-python,googlearchive/compute-appengine-demo-suite-python,gdgjodhpur/compute-appengine-demo-suite-python,gdgjodhpur/compute-appengine-demo-suite-python,googlearchive/compute-appengine-demo-suite-python,jonparrott/compute-appengine-demo-suite-python