Upgrade client-go and related to 1.15 (googleforgames#1532)

This upgrade client-go, apimachinery, apiextensions-apiserver and
related to support Kubernetes 1.15, as well as regenerated clients for
our CRDs.

Also included is a fix to gen-crd-client.sh such that it can now use Go
modules, as otherwise it was failing to generate clients.

Work on googleforgames#1478

build/build-image/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# ForceUpdate 11 -- change here if you need to force a rebuild
+# ForceUpdate 12 -- change here if you need to force a rebuild
 
 FROM debian:stretch
 

build/build-image/gen-crd-client.sh

@@ -16,13 +16,7 @@
 
 set -x
 
-# k8s.io/code-generator/generate-groups is not module-ready so it breaks things.
-export GO111MODULE=off
-rm -r $GOPATH/src/agones.dev/agones/pkg/client
-rsync -r /go/src/agones.dev/agones/vendor/k8s.io/ /go/src/k8s.io/
-cd /go/src/k8s.io/code-generator
-./generate-groups.sh "all" \
+bash /go/src/k8s.io/code-generator/generate-groups.sh "all" \
     agones.dev/agones/pkg/client \
     agones.dev/agones/pkg/apis "allocation:v1 agones:v1 multicluster:v1 autoscaling:v1" \
     --go-header-file=/go/src/agones.dev/agones/build/boilerplate.go.txt
-

go.mod

@@ -20,22 +20,20 @@ require (
 	github.com/grpc-ecosystem/grpc-gateway v1.11.3
 	github.com/hashicorp/golang-lru v0.5.1 // indirect
 	github.com/heptiolabs/healthcheck v0.0.0-20171201210846-da5fdee475fb
-	github.com/imdario/mergo v0.3.5 // indirect
 	github.com/joonix/log v0.0.0-20180502111528-d2d3f2f4a806
 	github.com/json-iterator/go v1.1.5 // indirect
 	github.com/mattbaird/jsonpatch v0.0.0-20171005235357-81af80346b1a
 	github.com/munnerz/goautoneg v0.0.0-20120707110453-a547fc61f48d
 	github.com/onsi/ginkgo v1.8.0 // indirect
 	github.com/onsi/gomega v1.5.0 // indirect
-	github.com/pborman/uuid v1.2.0 // indirect
 	github.com/pkg/errors v0.8.1
 	github.com/prometheus/client_golang v0.9.2
 	github.com/sirupsen/logrus v1.2.0
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.3.1
 	github.com/stretchr/testify v1.5.0
 	go.opencensus.io v0.22.3
-	golang.org/x/net v0.0.0-20190620200207-3b0461eec859
+	golang.org/x/net v0.0.0-20190812203447-cdfb69ac37fc
 	golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2
 	golang.org/x/tools v0.0.0-20190328211700-ab21143f2384
 	google.golang.org/api v0.0.0-20190117000611-43037ff31f69 // indirect
@@ -45,11 +43,10 @@ require (
 	gopkg.in/fsnotify.v1 v1.4.7
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/natefinch/lumberjack.v2 v2.0.0-20170531160350-a96e63847dc3
-	k8s.io/api v0.0.0-20191004102349-159aefb8556b // kubernetes-1.14.10
-	k8s.io/apiextensions-apiserver v0.0.0-20191212015246-8fe0c124fb40 // kubernetes-1.14.10
-	k8s.io/apimachinery v0.0.0-20191004074956-c5d2f014d689 // kubernetes-1.14.10
-	k8s.io/client-go v11.0.1-0.20191029005444-8e4128053008+incompatible // kubernetes-1.14.10
+	k8s.io/api v0.15.11
+	k8s.io/apiextensions-apiserver v0.0.0-20200318010201-8546efc3bc75 // kubernetes-1.15.11
+	k8s.io/apimachinery v0.15.11
+	k8s.io/client-go v0.15.11
 	k8s.io/kube-openapi v0.0.0-20190709113604-33be087ad058 // indirect
 	k8s.io/utils v0.0.0-20200124190032-861946025e34 // indirect
-	sigs.k8s.io/yaml v1.1.0 // indirect
 )

site/content/en/docs/Reference/agones_crd_api_reference.html

@@ -5060,7 +5060,6 @@ <h3 id="WebhookPolicy">WebhookPolicy
 <p><code>service</code> is a reference to the service for this webhook. Either
 <code>service</code> or <code>url</code> must be specified.</p>
 <p>If the webhook is running within the cluster, then you should use <code>service</code>.</p>
-<p>Port 443 will be used if it is open, otherwise it is an error.</p>
 </td>
 </tr>
 <tr>