Upgrade etcd to 3.4.3 (#5998)

README.md

roles/download/defaults/main.yml

roles/etcd/handlers/backup.yml

roles/etcd/tasks/configure.yml

roles/etcd/tasks/join_etcd-events_member.yml

roles/etcd/tasks/join_etcd_member.yml

roles/etcd/templates/etcd-events.env.j2

roles/etcd/templates/etcd.env.j2

roles/network_plugin/canal/tasks/main.yml

roles/recover_control_plane/etcd/tasks/main.yml

.../recover_control_plane/etcd/tasks/recover_lost_quorum.yml

roles/remove-node/post-remove/tasks/main.yml

roles/remove-node/remove-etcd-node/tasks/main.yml

scripts/collect-info.yaml