Revert "Fixed issue with tty"

Reverts BitPiston/homestead#17

Apparently this is not recommended – more so it hides all the output of provision.sh which is rather unhelpful testing provisioning.

>config.ssh.pty - If true, pty will be used for provisioning. Defaults to false.

>This setting is an advanced feature that should not be enabled unless absolutely necessary. It breaks some other features of Vagrant, and is really only exposed for cases where it is absolutely necessary. If you can find a way to not use a pty, that is recommended instead.