fix vendor path.
fix vendor path.

We need to have a test case that fails when any dep path is not
vendored. (until we use gx fully that is, and vendor everything
with it)

License: MIT
Signed-off-by: Juan Batiz-Benet <b49a5780a99ea81284fc0746a78f84a30e4d5c73@benet.ai>

libp2p/go-libp2p-kad-dht