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Automatic merge from submit-queue Security Group support for OpenStack Load Balancers <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, read our contributor guidelines https://github.com/kubernetes/kubernetes/blob/master/CONTRIBUTING.md and developer guide https://github.com/kubernetes/kubernetes/blob/master/docs/devel/development.md 2. If you want *faster* PR reviews, read how: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/faster_reviews.md 3. Follow the instructions for writing a release note: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/pull-requests.md#release-notes --> **Add Security Group Support for OpenStack Load Balancers**: fixes #29745 adds OpenStack support to the work done in #20392 **Release note**: ``` This allows security groups to be created and attached to the neutron port that the load balancer is using on the subnet. The security group ID that is assigned to the nodes needs to be provided, to allow for traffic from the load balancer to the nodePort to be reflected in the rules. This adds two config items to the LoadBalancer options - ManageSecurityGroups (bool) NodeSecurityGroupID (string) ```