roles/dch-openvpn-server: Deploy OpenVPN server

The *dch-openvpn-server* role installs and configures OpenVPN and
stunnel to provide both native OpenVPN service as well as
OpenVPN-over-TLS. The latter uses stunnel, listening on TCP port 9876,
to allow better firewall traversal and TCP port sharing via reverse
proxy.

roles/dch-openvpn-server/handlers/main.yml

@@ -0,0 +1,8 @@
+- name: restart pyrocufflink openvpn server
+  service:
+    name=openvpn-server@pyrocufflink
+    state=restarted
+- name: restart stunnel openvpn proxy
+  service:
+    name=stunnel@openvpn
+    state=restarted