drop unused etcd logic

Fixes #1660

roles/download/defaults/main.yml

@@ -34,16 +34,12 @@ flannel_cni_version: "v0.2.0"
 pod_infra_version: 3.0
 
 # Download URLs
-etcd_download_url: "https://storage.googleapis.com/kargo/{{etcd_version}}_etcd"
 kubeadm_download_url: "https://storage.googleapis.com/kubernetes-release/release/{{ kubeadm_version }}/bin/linux/amd64/kubeadm"
 
 # Checksums
-etcd_checksum: "274c46a7f8d26f7ae99d6880610f54933cbcf7f3beafa19236c52eb5df8c7a0b"
 kubeadm_checksum: "ddd5949699d6bdbc0b90b379e7e534f137b1058db1acc8f26cc54843f017ffbf"
 
 # Containers
-# Possible values: host, docker
-etcd_deployment_type: "docker"
 etcd_image_repo: "quay.io/coreos/etcd"
 etcd_image_tag: "{{ etcd_version }}"
 flannel_image_repo: "quay.io/coreos/flannel"
@@ -124,18 +120,10 @@ downloads:
     sha256: "{{ netcheck_agent_digest_checksum|default(None) }}"
     enabled: "{{ deploy_netchecker|bool }}"
   etcd:
-    version: "{{etcd_version}}"
-    dest: "etcd/etcd-{{ etcd_version }}-linux-amd64.tar.gz"
-    sha256: >-
-      {%- if etcd_deployment_type in [ 'docker', 'rkt' ] -%}{{etcd_digest_checksum|default(None)}}{%- else -%}{{etcd_checksum}}{%- endif -%}
-    source_url: "{{ etcd_download_url }}"
-    url: "{{ etcd_download_url }}"
-    unarchive: true
-    owner: "etcd"
-    mode: "0755"
-    container: "{{ etcd_deployment_type in [ 'docker', 'rkt' ] }}"
+    container: true
     repo: "{{ etcd_image_repo }}"
     tag: "{{ etcd_image_tag }}"
+    sha256: "{{etcd_digest_checksum|default(None)}}"
   kubeadm:
     version: "{{ kubeadm_version }}"
     dest: "kubeadm"

roles/etcd/defaults/main.yml

@@ -3,7 +3,6 @@
 etcd_cluster_setup: true
 
 etcd_backup_prefix: "/var/backups"
-etcd_bin_dir: "{{ local_release_dir }}/etcd/etcd-{{ etcd_version }}-linux-amd64/"
 etcd_data_dir: "/var/lib/etcd"
 
 etcd_config_dir: /etc/ssl/etcd

roles/etcd/tasks/install_docker.yml

 ---
-# Plan A: no docker-py deps
 - name: Install | Copy etcdctl binary from docker container
   command: sh -c "{{ docker_bin_dir }}/docker rm -f etcdctl-binarycopy;
            {{ docker_bin_dir }}/docker create --name etcdctl-binarycopy {{ etcd_image_repo }}:{{ etcd_image_tag }} &&