Fix busy test to wait for thread to start

test/vagrant/busy_test.rb

@@ -54,9 +54,11 @@ class BusyTest < Test::Unit::TestCase
     should "report busy to the outside world regardless of thread" do
       Thread.new do
         Vagrant.busy do
-          sleep(1)
+          sleep(2)
         end
       end
+      # Give the thread time to start
+      sleep(1)
 
       # While the above thread is executing vagrant should be busy
       assert Vagrant.busy?