Testing on windows with vagrant

What does this MR do?

Here we are providing a vagrant configuration file for running tests on windows 10.

Howto use this

first install vagrant and virtualbox

1. vagrant up
   • this will download a pre-provisioned win10 evaluation license from vagrant cloud
   • once started it will install go, git and OpenSSH
2. vagrant ssh
   • when prompted for a password enter vagrant
3. Run the test

      cd %RUNNER_SRC%
      powershell ci\test_windows.ps1
      exit

4. vagrant halt
5. vagrant destroy

Why was this MR needed?

This is a quick way for running tests on windows using a virtual machine directly from the developer workstation.

So far I got a failure on the following packages:

• gitlab.com/gitlab-org/gitlab-runner/commands/helpers
• gitlab.com/gitlab-org/gitlab-runner/executors/docker/machine
• gitlab.com/gitlab-org/gitlab-runner/executors/shell
• gitlab.com/gitlab-org/gitlab-runner/helpers/archives
• gitlab.com/gitlab-org/gitlab-runner/helpers/docker

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Tests
  • Added for this feature/bug
  • All builds are passing
• Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

• #3757 (closed)