Update Vagrantfile.erb

This was fixed in 3.0, but not back ported to 2.x...

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

...since 3.0 is still in beta, how about another 2.x release, since this breaks right off the bat out of the box?