Merge pull request #50211 from NuxiNL/util-freebsd

Automatic merge from submit-queue (batch tested with PRs 49869, 47987, 50211, 50804, 50583)

Make socket address parsing work on FreeBSD.

**What this PR does / why we need it**:

I am currently in the process of porting Kubernetes to work on FreeBSD. What is interesting is that I am not interested in using Kubernetes to run Docker containers in this case. I happen to be the author of CloudABI, a sandboxing framework that is available on FreeBSD (and other systems). I want to have a cluster management tool for scheduling these sandboxed processes.

Anyway, right now `kubelet` crashes on startup when passing in CRI command line flags, for the reason that it's not able to parse `unix:...` socket addresses. This change fixes this by making the respective Linux-only source file work on FreeBSD as well.

Author: Kubernetes Submit Queue