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/etcd/handlers/main.yml

@@ -2,18 +2,18 @@
 - name: restart etcd
   command: /bin/true
   notify:
-    - reload systemd
+    - etcd | reload systemd
     - reload etcd
     - wait for etcd up
 
 - name: restart etcd-proxy
   command: /bin/true
   notify:
-    - reload systemd
+    - etcd | reload systemd
     - reload etcd-proxy
     - wait for etcd up
 
-- name: reload systemd
+- name: etcd | reload systemd
   command: systemctl daemon-reload
   when: ansible_service_mgr == "systemd"