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/network_plugin/calico/templates/calico-node.service.j2

@@ -1,8 +1,8 @@
 [Unit]
 Description=Calico per-node agent
 Documentation=https://github.com/projectcalico/calico-docker
-Wants=docker.service etcd-proxy.service
 After=docker.service etcd-proxy.service
+Wants=docker.socket
 
 [Service]
 User=root