Fix etcd restart and handler systemd tasks

Changed Wants=docker.service to docker.socket

Renamed handlers for reloading systemd to contain role in task name.

roles/docker/handlers/main.yml

@@ -2,14 +2,14 @@
 - name: restart docker
   command: /bin/true
   notify:
-    - reload systemd
-    - reload docker
+    - Docker | reload systemd
+    - Docker | reload docker
 
-- name : reload systemd
+- name : Docker | reload systemd
   shell: systemctl daemon-reload
   when: ansible_service_mgr == "systemd"
 
-- name: reload docker
+- name: Docker | reload docker
   service:
     name: docker
     state: restarted