Update README and build scripts to recommend Vagrant >= 2.2.2

[6r0k3d]

• Operating System Version: Ubuntu 18.10
• Provider (VirtualBox/VMWare): Virtualbox
• Vagrant Version: 2.0.3
• Packer Version: N/A
• Is the issue reproducible or intermittent? Reproducible

Description of the issue:

README recommends Vagrant >= 1.9.2. Recommend updating that to 2.2.2. Looks like earlier versions, at least to 2.0.3, don't like the default_nic_type setting in the Vagrantfile.

Tried spinning the lab up on an Ubuntu machine. The current Ubuntu Vagrant package is 2.0.2.

This runs into an issue with fog-core. Manually updating to 2.0.3 as recommended solves that issue.

However, after running vagrant up with 2.0.3, I get the following error:

VirtualBox Provider:
* The following settings shouldn't exist: default_nic_type

Manually updating to 2.2.2 from Vagrant fixes the issue.

[clong]

Hey @6r0k3d - thanks for the report! I'll update the README and build scripts to ensure version 2.2.2 or greater is being used.

[clong]

Should be fixed in #187