vendor: Initialize the vendoring with dep tool

Gopkg.toml

@@ -0,0 +1,52 @@
+[[constraint]]
+  name = "github.com/gogo/protobuf"
+  revision = "342cbe0a04158f6dcb03ca0079991a51a4248c02"
+
+[[constraint]]
+  name = "github.com/golang/protobuf"
+  revision = "1e59b77b52bf8e4b449a57e6f79f21226d571845"
+
+[[constraint]]
+  name = "github.com/hashicorp/yamux"
+  revision = "f5742cb6b85602e7fa834e9d5d91a7d7fa850824"
+
+[[constraint]]
+  name = "github.com/mdlayher/vsock"
+  revision = "738c88d6e4cfd60e8124a5344fa10d205fd828b9"
+
+[[constraint]]
+  name = "github.com/opencontainers/runc"
+  revision = "2e7cfe036e2c6dc51ccca6eb7fa3ee6b63976dcd"
+
+[[constraint]]
+  name = "github.com/opencontainers/runtime-spec"
+  revision = "4e3b9264a330d094b0386c3703c5f379119711e8"
+
+[[constraint]]
+  name = "github.com/sirupsen/logrus"
+  revision = "f006c2ac4710855cf0f916dd6b77acf6b048dc6e"
+
+[[constraint]]
+  name = "github.com/stretchr/testify"
+  revision = "69483b4bd14f5845b5a1e55bca19e954e827f1d0"
+
+[[constraint]]
+  name = "github.com/vishvananda/netlink"
+  revision = "f67b75edbf5e3bb7dfe70bb788610693a71be3d1"
+
+[[constraint]]
+  name = "golang.org/x/net"
+  revision = "a8b9294777976932365dabb6640cf1468d95c70f"
+
+[[constraint]]
+  name = "golang.org/x/sys"
+  revision = "8b4580aae2a0dd0c231a45d3ccb8434ff533b840"
+
+[[constraint]]
+  name = "google.golang.org/grpc"
+  revision = "5a9f7b402fe85096d2e1d0383435ee1876e863d0"
+
+[prune]
+  non-go = true
+  go-tests = true
+  unused-packages = true