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Automatic merge from submit-queue (batch tested with PRs 64575, 65120, 65463, 65434, 65522). 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>. Add support for Linux Abstract Socket Namespace for KMS provider plugin. **What this PR does / why we need it**: Currently, kube-apiserver and kms-plugin interact via a Unix Domain Socket. The current implementation, assumes that such a Domain Socket is supported via a socket file, which is in turn is supported via a volume shared between kube-apiserver and kms-plugin containers. However, Linux supports Abstract Socket Namespace, where a socket does not need to be back-up by a file. In golang, such sockets are created by prefixing a socket's name with @. Benefits of using Linux Abstract Socket Namespace: 1. Don't need to worry about possible collisions with existing files. 2. Simpler configuration of master's manifest - no need to setup a shared volume between kube-apiserver and kms-plugin containers. 3. Don't need to remember to unlink the socket when KMS Plugin shuts down. 4. Creates a possibility to run KMS Plugin without access to file system. This PR adds the ability to define a KMS endpoint as: unix:///@kms-provider.sock **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Fixes # **Special notes for your reviewer**: **Release note**: ```release-note NONE ```