Add vagrant file for setting devstack for Zun

This patch adds necessary files and script for setting up
a zun devstack environment through vagrant. This will help
to boost productivity of zun developers.

Implements: blueprint vagrant-support-zun
Change-Id: Iacbf777b46208d7b1d52390b9c4a3c5a4229573e

contrib/vagrant/README.md

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+vagrant-devstack-zun
+=======================
+
+A Vagrant based devstack setup for zun.
+Steps to try vagrant image:
+1. Install virtual-box and vagrant on your local machine.
+2. Git clone zun repository.
+3. cd zun/contrib/vagrant
+4. vagrant up
+   It will take around 20 mins.
+5. vagrant ssh
+   You will get vm shell with all necessary setup.
+
+Note: For enabling/disabling various services, please see below file:
+      zun/contrib/vagrant/config/localrc

contrib/vagrant/Vagrantfile

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+VAGRANTFILE_API_VERSION = "2"
+
+Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
+
+  #https://atlas.hashicorp.com/bento/boxes/ubuntu-16.04
+  config.vm.box = "bento/ubuntu-16.04"
+
+  #below box has an issue, https://bugs.launchpad.net/cloud-images/+bug/1569237
+  #config.vm.box_url = "https://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-vagrant.box"
+
+  config.vm.hostname = "devstack"
+
+  config.vm.provider "virtualbox" do |vb|
+    vb.customize ["modifyvm", :id, "--memory", "4096"]
+  end
+
+  config.vm.provision :shell, :path => "provision.sh"
+
+  if Vagrant.has_plugin?("vagrant-cachier")
+    config.cache.scope = :box
+  end
+
+end

contrib/vagrant/config/localrc

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+HOST_IP=$(ip addr | grep 'state UP' -A2 | tail -n1 | awk '{print $2}' | cut -f1  -d'/')
+DATABASE_PASSWORD=password
+RABBIT_PASSWORD=password
+SERVICE_TOKEN=password
+SERVICE_PASSWORD=password
+ADMIN_PASSWORD=password
+enable_plugin zun https://git.openstack.org/openstack/zun
+
+#Optional:  uncomment to enable the Zun UI plugin in Horizon
+#enable_plugin zun-ui https://git.openstack.org/openstack/zun-ui
+
+#Uncomment below variables and enable nova and neutron
+#services to use nova docker driver
+#ZUN_DRIVER=nova-docker
+#IP_VERSION=4
+disable_service n-api,n-cpu,n-cond,n-sch,n-novnc,n-cauth
+disable_service q-svc,q-dhcp,q-meta,q-agt,q-l3
+disable_service neutron
+
+#comment out below line to use Horizon Dashboard
+disable_service horizon
+
+#comment out below line to use Cinder
+disable_service c-sch,c-api,c-vol
+
+#comment out below line to use tempest
+disable_service tempest

contrib/vagrant/install_devstack.sh

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+#!/bin/sh
+
+export OS_USER=vagrant
+
+BASHPATH=$(dirname "$0"\")
+echo "run script from $BASHPATH"
+
+# update system
+export DEBIAN_FRONTEND noninteractive
+sudo apt-get update
+sudo apt-get install -qqy git
+
+# determine checkout folder
+PWD=$(su "$OS_USER" -c "cd && pwd")
+DEVSTACK=$PWD/devstack
+
+# check if devstack is already there
+if [ ! -d "$DEVSTACK" ]
+then
+  echo "Download devstack into $DEVSTACK"
+
+  # clone devstack
+  su "$OS_USER" -c "cd && git clone -b master https://github.com/openstack-dev/devstack.git $DEVSTACK"
+
+  echo "Copy configuration"
+
+  # copy localrc settings (source: devstack/samples/localrc)
+  echo "copy config from $BASHPATH/config/localrc to $DEVSTACK/localrc"
+  cp "$BASHPATH"/config/localrc "$DEVSTACK"/localrc
+  chown "$OS_USER":"$OS_USER" "$DEVSTACK"/localrc
+
+fi
+
+
+# start devstack
+echo "Start Devstack"
+su "$OS_USER" -c "cd $DEVSTACK && ./stack.sh"

contrib/vagrant/provision.sh

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+#!/bin/sh
+
+
+# run script
+sh /vagrant/install_devstack.sh