Fixes #1355: Make Drush alias for 'local' work in VM guest or host by default.

[geerlingguy]

Fixes #1355.

[geerlingguy]

Note that this seems to work for me—get_current_user() works when I'm running on my Mac/host, but inside Drupal VM it returns empty... but I'm not sure if there's an easier/faster way to determine if we're inside a VM or not.

[lcatlett]

@geerlingguy i've used the following for the same:

// [vagrant_machine_name].local
$aliases['${project.machine_name}.local'] = array(
  // /var/www/${project.machine_name}/docroot
  'root' => '/var/www/${project.machine_name}/docroot',
  // vagrant_hostname
  'uri' => '${project.local.uri}',
  );
if ('vagrant' != $_SERVER['USER']) {
  $aliases['${project.machine_name}.local'] += array(
    // vagrant_hostname
    'remote-host' => '${project.local.hostname}',
    'remote-user' => 'vagrant',
    'ssh-options' => '-o PasswordAuthentication=no -i ' . drush_server_home() . '/.vagrant.d/insecure_private_key'
  );
}

[geerlingguy]

@lcatlett - Ooh, that could actually be better. I'll change my PR tomorrow, unless you want to build off this one or send up a new one before I get to it.

[geerlingguy]

@lcatlett / @grasmash - rebased and updated. Looks better to me!