How To Use Terraform with DigitalOcean

haproxy-www.tf

resource "digitalocean_droplet" "haproxy-www" {
    image = "ubuntu-14-04-x64"
    name = "haproxy-www"
    region = "nyc2"
    size = "512mb"
    private_networking = true
    ssh_keys = [
      "${var.ssh_fingerprint}"
    ]
  connection {
      user = "root"
      type = "ssh"
      key_file = "${var.pvt_key}"
      timeout = "2m"
  }
  provisioner "remote-exec" {
    inline = [
      "export PATH=$PATH:/usr/bin",
      # install haproxy 1.5
      "sudo add-apt-repository -y ppa:vbernat/haproxy-1.5",
      "sudo apt-get update",
      "sudo apt-get -y install haproxy",

      # download haproxy conf
      "sudo wget https://gist.githubusercontent.com/thisismitch/91815a582c27bd8aa44d/raw/8fc59b7cb88a2be9b802cd76288ca1c2ea957dd9/haproxy.cfg -O /etc/haproxy/haproxy.cfg",

      # replace ip address variables in haproxy conf to use droplet ip addresses
      "sudo sed -i 's/HAPROXY_PUBLIC_IP/${digitalocean_droplet.haproxy-www.ipv4_address}/g' /etc/haproxy/haproxy.cfg",
      "sudo sed -i 's/WWW_1_PRIVATE_IP/${digitalocean_droplet.www-1.ipv4_address_private}/g' /etc/haproxy/haproxy.cfg",
      "sudo sed -i 's/WWW_2_PRIVATE_IP/${digitalocean_droplet.www-2.ipv4_address_private}/g' /etc/haproxy/haproxy.cfg",

      # restart haproxy to load changes
      "sudo service haproxy restart"
    ]
  }
}

haproxy.cfg

global
  maxconn 2048
	log /dev/log	local0
	log /dev/log	local1 notice
	chroot /var/lib/haproxy
	stats socket /run/haproxy/admin.sock mode 660 level admin
	stats timeout 30s
	user haproxy
	group haproxy
	daemon

	# Default SSL material locations
	ca-base /etc/ssl/certs
	crt-base /etc/ssl/private

	# Default ciphers to use on SSL-enabled listening sockets.
	# For more information, see ciphers(1SSL).
	ssl-default-bind-ciphers kEECDH+aRSA+AES:kRSA+AES:+AES256:RC4-SHA:!kEDH:!LOW:!EXP:!MD5:!aNULL:!eNULL

defaults
	log	global
	mode	http
	option	httplog
	option	dontlognull
  option  forwardfor
  option  http-server-close
  stats enable
  stats uri /stats
  stats realm Haproxy\ Statistics
  stats auth hapuser:password!1234
  timeout connect 5000
  timeout client  50000
  timeout server  50000
	errorfile 400 /etc/haproxy/errors/400.http
	errorfile 403 /etc/haproxy/errors/403.http
	errorfile 408 /etc/haproxy/errors/408.http
	errorfile 500 /etc/haproxy/errors/500.http
	errorfile 502 /etc/haproxy/errors/502.http
	errorfile 503 /etc/haproxy/errors/503.http
	errorfile 504 /etc/haproxy/errors/504.http

frontend www-http
  bind HAPROXY_PUBLIC_IP:80
  default_backend www-backend

backend www-backend
  server www-1 WWW_1_PRIVATE_IP:80 check
  server www-2 WWW_2_PRIVATE_IP:80 check

provider.tf

variable "do_token" {}
variable "pub_key" {}
variable "pvt_key" {}
variable "ssh_fingerprint" {}

provider "digitalocean" {
  token = "${var.do_token}"
}

www-1.tf

resource "digitalocean_droplet" "www-1" {
    image = "ubuntu-14-04-x64"
    name = "www-1"
    region = "nyc2"
    size = "512mb"
    private_networking = true
    ssh_keys = [
      "${var.ssh_fingerprint}"
    ]
  connection {
      user = "root"
      type = "ssh"
      key_file = "${var.pvt_key}"
      timeout = "2m"
  }
  provisioner "remote-exec" {
    inline = [
      "export PATH=$PATH:/usr/bin",
      # install nginx
      "sudo apt-get update",
      "sudo apt-get -y install nginx"
    ]
  }
}

www-2.tf

resource "digitalocean_droplet" "www-2" {
    image = "ubuntu-14-04-x64"
    name = "www-2"
    region = "nyc2"
    size = "512mb"
    private_networking = true
    ssh_keys = [
      "${var.ssh_fingerprint}"
    ]
  connection {
      user = "root"
      type = "ssh"
      key_file = "${var.pvt_key}"
      timeout = "2m"
  }
  provisioner "remote-exec" {
    inline = [
      "export PATH=$PATH:/usr/bin",
      # install nginx
      "sudo apt-get update",
      "sudo apt-get -y install nginx"
    ]
  }
}

I've updated your files a bit to make it work
https://gist.github.com/mvasilenko/fe32084973640b105088a71ab30b035e/revisions