Fix creating Windows slaves with latest gcloud version
Fix creating Windows slaves with latest gcloud version

Fixed https://github.com/bazelbuild/continuous-integration/issues/52

Change-Id: Ib1ac8d555d70384617a3f425b19042be4b3d0be0

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration