Automatic merge from submit-queue (batch tested with PRs 66284, 66690). 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>.

Exit gce kube-up.sh early if openssl is LibreSSL

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

macOS has an openssl binary, but it's actually LibreSSL, which doesn't play well with the easyrsa script that cluster/gce/util.sh uses to generate certs

Instead of waiting until we generate certs to discover easyrsa doesn't work, consider openssl a prereq for gce, and include a check for the version string starting with OpenSSL

Also, mirror kube-up.sh's "... calling" output in kube-down.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)*:
Fixes kubernetes/community#1954

```release-note
NONE
```