Added Vagrantfile for PostgreSQL integration tests

Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# Vagratnfile for running integration tests with PostgreSQL
+
+VAGRANTFILE_API_VERSION = "2"
+
+$ubuntu_setup_script = <<SETUP_SCRIPT
+apt-get update
+apt-get install -y vim build-essential postgresql postgresql-contrib git
+curl -o /tmp/go.tar.gz https://storage.googleapis.com/golang/go1.7.3.linux-amd64.tar.gz
+tar -C /usr/local -xzf /tmp/go.tar.gz
+echo "export PATH=$PATH:/usr/local/go/bin" >> /home/vagrant/.profile
+echo "export GOPATH=/home/vagrant" >> /home/vagrant/.profile
+mkdir -p /home/vagrant/src/acme-dns
+chown -R vagrant /home/vagrant/src
+cp /vagrant/test/run_integration.sh /home/vagrant
+bash /vagrant/test/pgsql.sh
+echo "To run integration tests run /home/vagrant/run_integration.sh"
+SETUP_SCRIPT
+
+Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
+
+  config.vm.define "ad-ubuntu-trusty", primary: true do |ad_ubuntu_trusty|
+    ad_ubuntu_trusty.vm.box = "ubuntu/trusty64"
+    ad_ubuntu_trusty.vm.provision "shell", inline: $ubuntu_setup_script
+    ad_ubuntu_trusty.vm.network "forwarded_port", guest: 8080, host: 8008
+    ad_ubuntu_trusty
+    ad_ubuntu_trusty.vm.provider "virtualbox" do |v|
+      v.memory = 2048
+    end
+  end
+
+end

test/pgsql.sh

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+#!/bin/sh
+sudo -u postgres createdb acmedns
+sudo -u postgres psql -c "CREATE USER acmedns WITH PASSWORD 'acmedns'"
+sudo -u postgres psql -c "GRANT ALL PRIVILEGES ON DATABASE acmedns TO acmedns"

test/run_integration.sh

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+#!/bin/sh
+source /home/vagrant/.profile
+rm -rf /home/vagrant/src/acme-dns/*
+cp -R /vagrant/* /home/vagrant/src/acme-dns/
+cd /home/vagrant/src/acme-dns/
+go get
+go test -postgres