Moves to official vendoring solution

vendor/github.com/onsi/ginkgo/internal/specrunner/random_id.go

@@ -0,0 +1,15 @@
+package specrunner
+
+import (
+	"crypto/rand"
+	"fmt"
+)
+
+func randomID() string {
+	b := make([]byte, 8)
+	_, err := rand.Read(b)
+	if err != nil {
+		return ""
+	}
+	return fmt.Sprintf("%x-%x-%x-%x", b[0:2], b[2:4], b[4:6], b[6:8])
+}