Setup salt provisioning

This commit performs salt provisioning setup by adding salt master to
the salt VM and salt minion to all VMs. An /etc/hosts entry for the salt
master is added using a shell provisioner. No salt executions are
performed yet.

Vagrantfile

@@ -6,18 +6,34 @@ Vagrant.configure("2") do |config|
   config.vm.post_up_message = nil
   config.vm.synced_folder ".", "/vagrant", disabled: true
 
+  config.vm.provision "shell",
+      inline: "sed -i 's/^mesg n$/tty -s \\&\\& mesg n/g' /root/.profile"
+  config.vm.provision "shell",
+      path: "scripts/add_salt_to_etc_hosts.sh"
+  config.vm.provision :salt do |salt|
+      salt.masterless = false
+      salt.minion_config = "salt/minion"
+      salt.run_highstate = false
+      salt.install_type = "stable"
+  end
+
   config.vm.define "salt" do |node|
-      node.vm.hostname = "salt"
+      node.vm.hostname = "salt.gva.dev"
       node.vm.synced_folder "repos/gvasalt/states", "/srv/salt"
       node.vm.synced_folder "repos/gvasalt/pillar", "/srv/pillar"
       node.vm.network "private_network", ip: "172.16.4.10"
       node.vm.provider "virtualbox" do |vb|
           vb.memory = "256"
       end
+
+      node.vm.provision :salt do |salt|
+          salt.install_master = true
+          salt.minion_id = "salt"
+      end
   end
 
   config.vm.define "mq" do |node|
-      node.vm.hostname = "mq"
+      node.vm.hostname = "mq.gva.dev"
       node.vm.network "private_network", ip: "172.16.4.20"
       node.vm.provider "virtualbox" do |vb|
           vb.memory = "256"

salt/minion

@@ -0,0 +1 @@
+# empty minion config

scripts/add_salt_to_etc_hosts.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+set -e
+
+ip_address="172.16.4.10"
+host_name="salt.gva.dev"
+
+matches_in_host="$(grep -n $host_name /etc/hosts | cut -f1 -d:)"
+host_entry="${ip_address} ${host_name} salt"
+
+if [ ! -z "$matches_in_host" ]
+then
+    echo "Updating existing hosts entry"
+
+    echo $matches_in_host | while read -r line_number; do
+        sed -i "${line_number}s/.*/${host_entry}/" /etc/hosts
+    done
+else
+    echo "Adding new hosts entry"
+
+    echo "${host_entry}" >> /etc/hosts 
+fi