Support pinning the chef vault version

    - Pin to the latest non 3.x release https://github.com/chef/chef-vault/blob/master/Changelog.md

attributes/default.rb

@@ -152,3 +152,5 @@ else
   # Collector Restart Command
   default['sumologic']['collectorRestartCmd'] = "#{default['sumologic']['installDir']}/collector restart"
 end
+
+default['sumologic']['chef_vault_version'] = '2.9.0'

recipes/sumoconf.rb

@@ -33,6 +33,7 @@ credentials = {}
 
 chef_gem 'chef-vault' do
   compile_time true if respond_to?(:compile_time)
+  version node['sumologic']['chef_vault_version']
 end
 
 require 'chef-vault'