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Automatic merge from submit-queue OpenStack LBaaSV2: EnsureLoadBalancer now updates instead of recreates existing LBs <!-- 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 --> **What this PR does / why we need it**: Current LBaaSV2 integration recreates existing LBs and causes service downtime and floating ip rotation. New implementation updates LBs without service downtime or any ip rotation. **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #32794 **Special notes for your reviewer**: I really need this before we can move to production with kubernetes. Getting this to v1.4 would be really great. I have performed plenty of testing; lb and listener creation, port changing and listener update, multiple listeners for multi-port LBs, and deletion. Seems to work flawlessly. **Release note**: <!-- Steps to write your release note: 1. Use the release-note-* labels to set the release note state (if you have access) 2. Enter your extended release note in the below block; leaving it blank means using the PR title as the release note. If no release note is required, just write `NONE`. --> ```release-note ```