The OpenStack drivers were upstreamed into the Liberty release. If you are running Liberty, you already have the drivers and only need to config them to use your ScaleIO Cluster. No need to download and install them now! You can see it in the Cinder Support Matrix link below.  CinderSupportMatrix - OpenStack
Does EMC plan to support OpenStack Liberty for ScaleIO? If yes, when is release date?
Will ScaleIO support OpenStack Liberty?