Some commands like `vagrant init` and `vagrant box` should be able to
run successfully without a full Project available in VAGRANT_CWD (in
other words, they don't require that a valid Vagrantfile be available.)
Thus far we've been assuming that a Project is available when
dispatching commands, which mean that commands of this nature weren't
working.
Here we make the Basis available to serve as an alternative client to
Vagrant::Environment::Remote such that it can be instantiated and passed
through to commands. This required some changes to Environment::Remote
to make its interactions with the client more defensive, but we manage
to avoid needing to make any changes to the normal legacy codepaths.
