Refer to operator VM as primary VM

This allows us to execute vagrant commands by default on the 'operator'
VM and eliminate one of the difference between AIO and multinode.

TrivialFix

Change-Id: Ia14aa026d1146ec4b1e006c72a2460edfc0cf6eb

dev/vagrant/Vagrantfile

@@ -200,7 +200,7 @@ Vagrant.configure(2) do |config|
   end
 
   # The operator controls the deployment
-  config.vm.define "operator" do |admin|
+  config.vm.define "operator", primary: true do |admin|
     admin.vm.hostname = "operator.local"
     admin.vm.provision :shell, path: PROVISION_SCRIPT, args: "operator #{MULTINODE ? 'multinode' : 'aio'} #{get_default(:kolla_path)}"
     admin.vm.synced_folder File.join(vagrant_dir, '..', '..'), get_default(:kolla_path), create:"True", type: get_default(:sync_method)