When `--private` is passed to `clone`, we force a fetch from nodes that
aren't known seeds.
When it isn't specified, we skip nodes that aren't known seeds, even if
they are in the preferred seeds list. Previously, we would still fetch
from them, which would cause errors.
We were using the two pretty interchangeably. "Project" should only be
used to refer to the repository payload. "Repository" should be used
when referring to the resource that is fetched, synced, cloned, checked
out etc.
cloudhead