setting box_check_update to false does not disable box update checking

[roderickrandolph]

.kitchen.yml

---
driver:
  name: vagrant
  box_check_update: false
  vm_hostname: localhost

platforms:
  - name: chef/centos-6.6

Expect:

      Vagrant.configure("2") do |c|
        c.berkshelf.enabled = false if Vagrant.has_plugin?("vagrant-berkshelf")
        c.vm.box = "chef/centos-6.6"
        c.vm.box_check_update = "false"
        c.vm.hostname = "localhost"
        c.vm.synced_folder ".", "/vagrant", disabled: true
      end

Actual:

      Vagrant.configure("2") do |c|
        c.berkshelf.enabled = false if Vagrant.has_plugin?("vagrant-berkshelf")
        c.vm.box = "chef/centos-6.6"
        c.vm.hostname = "localhost"
        c.vm.synced_folder ".", "/vagrant", disabled: true
      end

Per the Automatic Update Checking section of the Vagrant documentation, box update checking is enabled by default if "box_check_update" is not explicitly disabled in the Vagrantfile.

[roderickrandolph]

PR #182 submitted

[cheeseplus]

Merged @4f53d5f