
Make sure we properly handle the case when multiple threads check and create the default security group, if it hasn't existed yet. One thread will succeed and others will fail (we have a unique constraint in db to prevent a race condition), so just handle the exception to let instance boot proceed. Steps to reproduce: 1) install OpenStack with Rally using DevStack: https://github.com/stackforge/rally/tree/master/contrib/devstack 2) fetch the Rally task: http://boris-42.github.io/boot.yaml 3) run it rally -v task start boot.yaml Closes-Bug: #1370782 Change-Id: I414637a31b0b540fefa6c1314be6e973e2d4a178