Use an external file to manage Vagrant variables

This is really handy when we are testing code since we don't need to
modify the Vagrantfile, which is tracked by git.
The next commit will ignore the vagrant_variables.yml file.

Signed-off-by: Sébastien Han <sebastien.han@enovance.com>

.gitignore

@@ -2,3 +2,4 @@
 *.vdi
 *.keyring
 fetch/4a158d27-f750-41d5-9e7f-26ce4c9d2d45/*
+vagrant_variables.yml

Vagrantfile

@@ -1,14 +1,18 @@
 # -*- mode: ruby -*-
 # vi: set ft=ruby :
 
+require 'yaml'
 VAGRANTFILE_API_VERSION = '2'
 
-NMONS   = 3
-NOSDS   = 3
-NMDSS   = 0
-NRGWS   = 0
-CLIENTS = 0
-SUBNET  = '192.168.42'
+config_file=File.expand_path(File.join(File.dirname(__FILE__), 'vagrant_variables.yml'))
+settings=YAML.load_file(config_file)
+
+NMONS   = settings['mon_vms']
+NOSDS   = settings['osd_vms']
+NMDSS   = settings['mds_vms']
+NRGWS   = settings['rgw_vms']
+CLIENTS = settings['client_vms']
+SUBNET  = settings['subnet']
 
 ansible_provision = proc do |ansible|
   ansible.playbook = 'site.yml'

vagrant_variables.yml

@@ -0,0 +1,11 @@
+---
+
+# DEFINE THE NUMBER OF VMS TO RUN
+mon_vms: 3
+osd_vms: 3
+mds_vms: 0
+rgw_vms: 0
+client_vms: 0
+
+# SUBNET TO USE FOR THE VMS
+subnet: 192.168.42