Dockerfile: Update to Ubuntu 14.04

* Upgrade to latest Ubuntu LTS release
Dockerfile: Add MAINTAINER line

* Add maintrainer line and credit jpetazzo
openvpn.sh: Add wrapper script

* Add the beginning of a wrapper script that will handle cert generation
  and OpenVPN invocation.
Dockerfile: Add EasyRSA-3 support

* EasyRSA v3 is preferred over v2 because it includes support for
  elliptic curves.
openvpn.sh: Add easyrsa to wrapper

* Provide a way to invoke easyrsa form the wrapper
* Add ability to set the EasyRSA vars file which manages the default
  settings for the EasyRSA PKI CA.
openvpn.sh: Implement init step and cert gen

* Initialize and configure the OpenVPN server
* Generate PKI keys, CA, and certs when needed
openvpn.sh: Save servername used during init

* Save the DNS domain name or IP address the server was configured with
* Useful for generating client configurations
openvpn.sh: Add getclientconfig

* Add mechanism to generate and return a client configuration
* Seemlessly Generates certificate if necessary
serveconfig: Remove

* Use the openvpn.sh wrapper script instead
openvpn.sh: Add log tail function

* Add ability to tail log file as original repo did.
run: Remove run script

* Replaced by openvpn.sh
Dockerfile: Remove unused ports

* These ports are unused, remove them to reduce confusion.