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/internal/math32/sqrt.go

@@ -0,0 +1,25 @@
+// Copyright ©2015 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.
+
+// +build !amd64 noasm appengine safe
+
+package math32
+
+import (
+	"math"
+)
+
+// Sqrt returns the square root of x.
+//
+// Special cases are:
+//	Sqrt(+Inf) = +Inf
+//	Sqrt(±0) = ±0
+//	Sqrt(x < 0) = NaN
+//	Sqrt(NaN) = NaN
+func Sqrt(x float32) float32 {
+	// FIXME(kortschak): Direct translation of the math package
+	// asm code for 386 fails to build. No test hardware is available
+	// for arm, so using conversion instead.
+	return float32(math.Sqrt(float64(x)))
+}