Do not install etcd and etcdctl on master with scale.yml playbook. (#6798)

Remove task with install etcdctl from etcd role when etcd_kubeadm_enabled=true

roles/etcd/tasks/main.yml

@@ -64,10 +64,3 @@
 # state instead of `new`.
 - include_tasks: refresh_config.yml
   when: is_etcd_master
-
-- name: Install etcdctl binary from etcd role
-  include_tasks: install_host.yml
-  vars:
-    etcd_cluster_setup: true
-  when:
-    - etcd_kubeadm_enabled