mitchellh/vagrant — pull request #1573 by benjixx (2013-04-10 20:11:39+00:00)
Title: fix root cause for error message when running in multi-vm environment

The following error message occurred due to missing settings:

```bash
SSH Defaults:
* The following settings don't exist: forward_agent, forward_x11
```

The default settings for forward_agent and forward_x11 have been removed in commit 41d6553 and thus are not accessible anymore.
This pull request removed the remaining references that are not needed anymore.