Relink vbox to vagrant

fix_relink_virtualbox_to_vagrant.md

It doesn't make much sense to reinstall Vagrantfile once lost the association with vbox, yet vbox is sitting right there.

Here's a list of steps you could ease your pain.

Steps:

1. Go to your Vagrantfile directory

2. Get the id of your target

   VBoxManage list vms
   
   "src_default_1403300208068_90865" {db83545f-61d2-4621-8edc-081c3b8a7530}
   

3. Relink to vagrant

   i.e.

   1. cd .vagrant/machines/default/virtualbox
   2. echo -n "db83545f-61d2-4621-8edc-081c3b8a7530" > id

   or

   1. echo -n "db83545f-61d2-4621-8edc-081c3b8a7530" > .vagrant/machines/default/virtualbox/id

* Works on vagrant 1.6.3

Reference:

hashicorp/vagrant#1755 (comment)