Fix parameter typo in the all-in-one scenario

Without this patch, the command "vagrant up build-server" failed when scenario
all-in-one is selected.

Bringing machine 'build-server' up with 'virtualbox' provider...
[build-server] Importing base box 'precise64'...
[build-server] Matching MAC address for NAT networking...
[build-server] Setting the name of the VM...
[build-server] Clearing any previously set forwarded ports...
[build-server] Fixed port collision for 22 => 2222. Now on port 2200.
[build-server] Creating shared folders metadata...
[build-server] Clearing any previously set network interfaces...
[build-server] Destroying VM and associated drives...
/usr/share/vagrant/plugins/providers/virtualbox/action/network.rb:245:in `hostonly_config': undefined method `+' for nil:NilClass (NoMethodError)
  from /usr/share/vagrant/plugins/providers/virtualbox/action/network.rb:82:in `block in call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/network.rb:75:in `each'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/network.rb:75:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/clear_network_interfaces.rb:26:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/share_folders.rb:25:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/clear_shared_folders.rb:12:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/prepare_nfs_settings.rb:11:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builtin/nfs.rb:28:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/prune_nfs_exports.rb:15:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builtin/handle_forwarded_port_collisions.rb:118:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/prepare_forwarded_port_collision_params.rb:30:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builtin/env_set.rb:19:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builtin/provision.rb:45:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/clear_forwarded_ports.rb:13:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/set_name.rb:35:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/clean_machine_folder.rb:17:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/check_accessible.rb:18:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:61:in `block in run'
  from /usr/lib/ruby/vendor_ruby/vagrant/util/busy.rb:19:in `busy'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:61:in `run'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builtin/call.rb:51:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:61:in `block in run'
  from /usr/lib/ruby/vendor_ruby/vagrant/util/busy.rb:19:in `busy'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:61:in `run'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builtin/call.rb:51:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:61:in `block in run'
  from /usr/lib/ruby/vendor_ruby/vagrant/util/busy.rb:19:in `busy'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:61:in `run'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builtin/call.rb:51:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builtin/config_validate.rb:25:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/check_virtualbox.rb:17:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builtin/call.rb:57:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builtin/config_validate.rb:25:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/share/vagrant/plugins/providers/virtualbox/action/check_virtualbox.rb:17:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/builder.rb:116:in `call'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:61:in `block in run'
  from /usr/lib/ruby/vendor_ruby/vagrant/util/busy.rb:19:in `busy'
  from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:61:in `run'
  from /usr/lib/ruby/vendor_ruby/vagrant/machine.rb:147:in `action'
  from /usr/lib/ruby/vendor_ruby/vagrant/batch_action.rb:63:in `block (2 levels) in run'

Change-Id: I13e1d3f71dc2ab3d0fd5f9d0aa886f7139f82601
Merge "Fix parameter typo in the all-in-one scenario"