Add support to stack update broke create server

[Everett Toews]

The commit for Add support to stack update [1] broke the ability to create a server. In particular it was this line [2] that removes the response body when a 202 is returned.

To reproduce the issue try to create a server with DevStack Liberty.

You can use the Create Server example [3] and run it with

    tox -e examples

or find a way to run it manually.

[1] https://github.com/openstack/python-openstacksdk/commit/1b3d713f48b5dbe8f63e02d7a85143c94578700c
[2] https://github.com/openstack/python-openstacksdk/commit/1b3d713f48b5dbe8f63e02d7a85143c94578700c#diff-fad27ae4ce4a689b49afcb010c90157fR270
[3] https://github.com/openstack/python-openstacksdk/blob/master/examples/compute/create.py#L28

[Everett Toews (everett-toews)]

This was fixed by the offending code being replace by keystoneauth in release 0.7.1.