Copy dependencies into vendor dir, using dep

vendor/github.com/docker/docker/client/network_remove.go

@@ -0,0 +1,10 @@
+package client // import "github.com/docker/docker/client"
+
+import "golang.org/x/net/context"
+
+// NetworkRemove removes an existent network from the docker host.
+func (cli *Client) NetworkRemove(ctx context.Context, networkID string) error {
+	resp, err := cli.delete(ctx, "/networks/"+networkID, nil, nil)
+	ensureReaderClosed(resp)
+	return wrapResponseError(err, resp, "network", networkID)
+}