This adds a new libmachine API implementation that skips RPC and instead
uses a vendored in driver directly. This removes the need to download a
separate driver binary. Currently, only the "core" drivers, and kvm are
supported as vendored in. This means that xhyve is the only driver that
requires a separate binary for now.
Libmachine logs can be enabled with --v=3 or higher. --v=7 turns on
debug level info. This will simplify the debugging control plane and
allow us to transition off of libmachine logs in the future.
Matt Rickard
vishah
Jimmi Dyson
Aaron Prindle