Remove sudo from generated Vagrantfile

This is unneeded because, by default, provisioners run as a privileged
user.

Fixes GH-7295

templates/commands/init/Vagrantfile.erb

@@ -74,7 +74,7 @@ Vagrant.configure("2") do |config|
   # Puppet, Chef, Ansible, Salt, and Docker are also available. Please see the
   # documentation for more information about their specific syntax and use.
   # config.vm.provision "shell", inline: <<-SHELL
-  #   sudo apt-get update
-  #   sudo apt-get install -y apache2
+  #   apt-get update
+  #   apt-get install -y apache2
   # SHELL
 end