1. update clientset, deepcopy using code-generator

2. add a dummy file tools.go to force "go mod vendor" to see
code-generator as dependencies
3. add a script to update CRD
4. add a README to document CRD updating steps
run go mod tidy
update README

vendor/gonum.org/v1/gonum/graph/simple/simple.go

@@ -0,0 +1,72 @@
+// Copyright ©2014 The Gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package simple
+
+import (
+	"math"
+
+	"gonum.org/v1/gonum/graph"
+)
+
+// Node is a simple graph node.
+type Node int64
+
+// ID returns the ID number of the node.
+func (n Node) ID() int64 {
+	return int64(n)
+}
+
+func newSimpleNode(id int) graph.Node {
+	return Node(id)
+}
+
+// Edge is a simple graph edge.
+type Edge struct {
+	F, T graph.Node
+}
+
+// From returns the from-node of the edge.
+func (e Edge) From() graph.Node { return e.F }
+
+// To returns the to-node of the edge.
+func (e Edge) To() graph.Node { return e.T }
+
+// ReversedLine returns a new Edge with the F and T fields
+// swapped.
+func (e Edge) ReversedEdge() graph.Edge { return Edge{F: e.T, T: e.F} }
+
+// WeightedEdge is a simple weighted graph edge.
+type WeightedEdge struct {
+	F, T graph.Node
+	W    float64
+}
+
+// From returns the from-node of the edge.
+func (e WeightedEdge) From() graph.Node { return e.F }
+
+// To returns the to-node of the edge.
+func (e WeightedEdge) To() graph.Node { return e.T }
+
+// ReversedLine returns a new Edge with the F and T fields
+// swapped. The weight of the new Edge is the same as
+// the weight of the receiver.
+func (e WeightedEdge) ReversedEdge() graph.Edge { return WeightedEdge{F: e.T, T: e.F, W: e.W} }
+
+// Weight returns the weight of the edge.
+func (e WeightedEdge) Weight() float64 { return e.W }
+
+// isSame returns whether two float64 values are the same where NaN values
+// are equalable.
+func isSame(a, b float64) bool {
+	return a == b || (math.IsNaN(a) && math.IsNaN(b))
+}
+
+type edgeSetter interface {
+	SetEdge(e graph.Edge)
+}
+
+type weightedEdgeSetter interface {
+	SetWeightedEdge(e graph.WeightedEdge)
+}