Add a BDD test suite for OpenStack stack (Read and Update)

@tamakifujino

Thank you for adding the scenario.

@xiaohua-guan

What do you think?

Thanks

@yas @tamakifujino

Thanks for your code. It looks good to me.

@xiaohua-guan

Thank you for your review.

@tamakifujino

I'll merge the patch to 4.x and 5.x, and close this issue as Fixed.

Automatically closed - issue fixed for 2 weeks with no activity.