Automatic merge from submit-queue (batch tested with PRs 59027, 62333, 57661, 62086, 61584). 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>.
local-up-cluster.sh: support preserving etcd optionally
Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
**What this PR does / why we need it**:
Allow `hack/local-up-cluster.sh` to support preserve `ETCD_DIR` when `PRESERVE` is set to non-false value.
usage:
```
$ PRESERVE=true ETCD_DIR=/var/lib/etcd-kube-HEAD .... \
./hack/local-up-cluster.sh
```
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
(None)
**Special notes for your reviewer**:
(None)
**Release note**:
```release-note
None
```
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