Switch to new vendor directory layout

Fixes #113

Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>

vendor/github.com/opencontainers/runc/libcontainer/utils/utils_test.go

@@ -0,0 +1,25 @@
+package utils
+
+import "testing"
+
+func TestGenerateName(t *testing.T) {
+	name, err := GenerateRandomName("veth", 5)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected := 5 + len("veth")
+	if len(name) != expected {
+		t.Fatalf("expected name to be %d chars but received %d", expected, len(name))
+	}
+
+	name, err = GenerateRandomName("veth", 65)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expected = 64 + len("veth")
+	if len(name) != expected {
+		t.Fatalf("expected name to be %d chars but received %d", expected, len(name))
+	}
+}