fix missing fulcrum standalone spec mocked nodes

Author: antmoth

spec/classes/role/fulcrum_standalone_spec.rb

@@ -5,6 +5,8 @@
 # BSD License. See LICENSE.txt for details.
 require "spec_helper"
 
+require_relative "../../support/contexts/with_mocked_nodes"
+
 describe "nebula::role::fulcrum::standalone" do
   on_supported_os.each do |os, os_facts|
     context "on #{os}" do