Merge pull request #54001 from cblecker/sed-func

Automatic merge from submit-queue. 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>.

Extract gnu-sed detection into a function

**What this PR does / why we need it**:
Moves gnu-sed detection into a reusable function across scripts (considering it's in multiple places).

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:
```release-note
NONE
```

hack/update-bazel.sh

@@ -20,14 +20,7 @@ set -o pipefail
 export KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
 source "${KUBE_ROOT}/hack/lib/init.sh"
 
-if LANG=C sed --help 2>&1 | grep -q GNU; then
-  SED="sed"
-elif which gsed &>/dev/null; then
-  SED="gsed"
-else
-  echo "Failed to find GNU sed as sed or gsed. If you are on Mac: brew install gnu-sed." >&2
-  exit 1
-fi
+kube::util::ensure-gnu-sed
 
 # Remove generated files prior to running kazel.
 # TODO(spxtr): Remove this line once Bazel is the only way to build.