Fix for updating vbguest ad-ons
Fix for updating vbguest ad-ons

Script for updating the kernel modules so updated vbguest ad-ons be
installed on the box. Code from
https://github.com/dotless-de/vagrant-vbguest/issues/141 thread.

vladistan/mlvagrant,rcouronne/mlvagrant,grtjn/mlvagrant,pawelkat/mlvagrant,peetkes/mlvagrant,grtjn/mlvagrant,vladistan/mlvagrant,rcouronne/mlvagrant,peetkes/mlvagrant,pawelkat/mlvagrant