ovpn_copy_server_files: Copy files without rsync
ovpn_copy_server_files: Copy files without rsync

* Hack around the missing rsync by using tar to preserve the directory
  structure.
* Fixes #73

elie195/docker-openvpn,slamont/docker-openvpn,richnologies/docker-openvpn,rdev02/docker-openvpn,hjnijlunsing/docker-openvpn-armhf,kylemanna/docker-openvpn,myplacedk/docker-openvpn