Thanks guys good to know. 
I will use only the sync as suggested...

On Wednesday, September 3, 2014, Jeremy Daggett <jeremy.daggett@rackspace.com> wrote:
The OpenStack Keystone v2.0 API is the last of the APIs that needs to be
de-asynced. There are some dependencies that need to be addressed yet, so
stay tuned!

/jd

On 9/2/14, 8:54 AM, "Andrew Phillips" <andrewp@apache.org> wrote:

>> is there a plan to change it? was it forgotten?
>
>The plan is still to "de-async" all APIs, including Keystone. If you
>are using the Keystone API, please use the sync interface if possible.
>
>Do you need to use the async interfaces in your code in any specific
>situations?
>
>ap