Merge pull request #67402 from SneakyFish5/etcd-error-message

Automatic merge from submit-queue (batch tested with PRs 65561, 67109, 67450, 67456, 67402). 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>.

Better error message if etcd not installed

**What this PR does / why we need it**:
Add an error message to install etcd if command check fails instead of just saying to add etcd to PATH.

**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
```

hack/lib/etcd.sh

@@ -24,6 +24,7 @@ kube::etcd::validate() {
   # validate if in path
   command -v etcd >/dev/null || {
     kube::log::usage "etcd must be in your PATH"
+    kube::log::info "You can use 'hack/install-etcd.sh' to install a copy in third_party/."
     exit 1
   }