contrib/vagrant/Vagrantfile

errors: restructure formatparse() to clarify conditions a bit

The `similar` list will be calculated only for
`error.UnknownIdentifier`. It was then printed only if `inst.location
is None`, which is true for that exception type, but it's an indirect
condition to rely on.

Also, it looked from the code like it could both report similarities
and print a hint. That would be a little awkward because the
similarity report looks similar to the hint (both are printed within
parentheses). I also added a `elif` to clarify that. I plan to
refactor this more coming patches so the similarity report actually is
a hint.

Differential Revision: https://phab.mercurial-scm.org/D9343

# -*- mode: ruby -*-

Vagrant.configure('2') do |config|
  # Debian 10.1 x86_64 without configuration management software
  config.vm.box = "debian/buster64"
  config.vm.hostname = "tests"

  config.vm.define "tests" do |conf|
    conf.vm.provision :file, source: "run-tests.sh", destination:"run-tests.sh"
    conf.vm.provision :shell, path: "provision.sh"
    conf.vm.synced_folder "../..", "/hgshared"
  end
end