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.

pkg/kubelet/util/BUILD

@@ -21,7 +21,7 @@ go_library(
         "util_unsupported.go",
     ] + select({
         "@io_bazel_rules_go//go/platform:linux_amd64": [
-            "util_linux.go",
+            "util_unix.go",
         ],
         "@io_bazel_rules_go//go/platform:windows_amd64": [
             "util_windows.go",

pkg/kubelet/util/util_unix.go

@@ -1,4 +1,4 @@
-// +build linux
+// +build freebsd linux
 
 /*
 Copyright 2017 The Kubernetes Authors.

pkg/kubelet/util/util_unsupported.go

@@ -1,4 +1,4 @@
-// +build !linux,!windows
+// +build !freebsd,!linux,!windows
 
 /*
 Copyright 2017 The Kubernetes Authors.