Vagrantfile.erb - removing V2 unsupported ssh options

Including these ssh options in Vagrantfile:

```
config.ssh.max_tries
config.ssh.timeout 
```
... causes vagrant (I'm running 1.3.5) to barf:
```
There are errors in the configuration of this machine. Please fix
the following errors and try again:

SSH:
* The following settings shouldn't exist: max_tries, timeout
```

And indeed, those options don't seem to exist in the v2 documentation:
http://docs.vagrantup.com/v2/vagrantfile/ssh_settings.html

I posit that a sane default Vagrantfile does not include these options.