Automatic merge from submit-queue (batch tested with PRs 43661, 54062). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Fix #43583 (kubenet: remove code forcing bridge MAC address) **What this PR does / why we need it**: *kubenet: remove code forcing bridge MAC address* **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #43583 **Special notes for your reviewer**: **Release note**: ```release-note ``` cc @dcbw @freehan