Temporary add feature pragma

OpenStackSDK has a feature branch "feature/r1" as a preparation for the
R1.0 release. Due to different branch naming functional tests with
devstack are not running. Add temporarily (for the duration of the
feature branch) pragma to the zuul.yaml to allow Zuul run functional
tests. It will be dropped once SDK gets next major release.

Change-Id: I671b589150fe731125e16316a994a5942219920b
1 file changed