install etcdctl to host when etcd deployment type is kubeadm (#6857)

* create a wrapper script with pki options
* supports all kubespray managed container engines

Co-authored-by: Hans Feldt <hafe@users.noreply.github.com>

roles/etcdctl/templates/etcdctl.sh.j2

@@ -0,0 +1,8 @@
+#!/bin/bash
+# {{ ansible_managed }}
+# example invocation: etcdctl.sh get --keys-only --from-key ""
+
+etcdctl \
+  --cacert {{ kube_cert_dir }}/etcd/ca.crt \
+  --cert {{ kube_cert_dir }}/etcd/server.crt \
+  --key {{ kube_cert_dir }}/etcd/server.key "$@"