test/acceptance: don't have the context show up as a component

test/acceptance/shared/context_virtualbox.rb

@@ -1,4 +1,4 @@
-shared_context "provider/virtualbox" do
+shared_context "provider-context/virtualbox" do
   let(:extra_env) {{
     "VBOX_USER_HOME" => "{{homedir}}",
   }}

vagrant-spec.config.example.rb

@@ -2,6 +2,6 @@ require_relative "test/acceptance/base"
 
 Vagrant::Spec::Acceptance.configure do |c|
   c.provider "virtualbox",
-    box_basic: "<PATH TO MINIMAL BOX>",
+    box: "<PATH TO MINIMAL BOX>",
     contexts: ["provider/virtualbox"]
 end