title: Vagrant can not create volume directories without sudo
body: <pre><code>$ vagrant up
  Bringing machine 'default' up with 'virtualbox' provider...
  ==&gt; default: Importing base box 'hashicorp/precise64'...
  There was an error while executing `VBoxManage`, a CLI used by Vagrant
  for controlling VirtualBox. The command and stderr is shown below.
  
  Command: ["import", "/Users/foo/.vagrant.d/boxes/hashicorp-VAGRANTSLASH-    precise64/1.1.0/virtualbox/box.ovf", "--vsys", "0", "--vmname", "precise64_1397758443675_63113", "--vsys", "0", "--unit", "9", "--disk", "/Volumes/untitled/precise64_1397758443675_63113/box-disk1.vmdk"]
  
  Stderr: 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
  Interpreting /Users/foo/.vagrant.d/boxes/hashicorp-VAGRANTSLASH-precise64/1.1.0/virtualbox/box.ovf...
  OK.
  0%...
  Progress state: VBOX_E_IPRT_ERROR
  VBoxManage: error: Appliance import failed
  VBoxManage: error: Could not create the directory '/Volumes/untitled/precise64_1397758443675_63113' (VERR_ACCESS_DENIED)
  VBoxManage: error: Details: code VBOX_E_IPRT_ERROR (0x80bb0005), component Appliance, interface IAppliance
  VBoxManage: error: Context: "int handleImportAppliance(HandlerArg*)" at line 779 of file     VBoxManageAppliance.cpp
  </code></pre>
  
  <p>Why is it having trouble creating the volume directories?</p>