Check Vault and other HashiCorp products version

Summary:
Critical infrastructure components should be up-to-date.

This monitoring check allows to check if Vault, Terraform, Consul
or Vagrant is installed to the last version available on
https://releases.hashicorp.com

Test Plan: bin/check_software_version vault

Reviewers: DorianWinty

Reviewed By: DorianWinty

Differential Revision: https://devcentral.nasqueron.org/D2809