pkg/apis/hive/v1alpha1: Make VPCCIDRBlock an *IPNet

Catching up with openshift/installer@b2d6fa40 (validate: simplify CIDR
validation, 2018-11-27, openshift/installer#711).

We can't convert the v1alpha1 type to an *IPNet, because it doesn't
have DeepCopyInto methods [1]:

  go vet ./pkg/... ./cmd/... ./contrib/...
  # github.com/openshift/hive/pkg/apis/hive/v1alpha1
  pkg/apis/hive/v1alpha1/zz_generated.deepcopy.go:87:8: (*in).DeepCopyInto undefined (type *ipnet.IPNet has no field or method DeepCopyInto)

We used to define those methods in the installer, but stopped in
openshift/installer@ca6f6195 (Revert "pkg/ipnet: Add DeepCopy and
DeepCopyInto for IPNet", 2018-09-20, openshift/installer#295).

[1]: https://storage.googleapis.com/origin-ci-test/pr-logs/pull/openshift_hive/144/pull-ci-openshift-hive-master-unit/253/build-log.txt

pkg/apis/hive/v1alpha1/installconfig.go

@@ -72,7 +72,8 @@ type AWSPlatform struct {
 	DefaultMachinePlatform *AWSMachinePoolPlatform `json:"defaultMachinePlatform,omitempty"`
 
 	// VPCCIDRBlock
-	VPCCIDRBlock string `json:"vpcCIDRBlock"`
+	// +optional
+	VPCCIDRBlock string `json:"vpcCIDRBlock,omitempty"`
 }
 
 // LibvirtPlatform stores all the global configuration that

pkg/install/convertconfig.go

@@ -18,7 +18,6 @@ package install
 
 import (
 	"fmt"
-	"net"
 
 	hivev1 "github.com/openshift/hive/pkg/apis/hive/v1alpha1"
 
@@ -50,7 +49,7 @@ func GenerateInstallConfig(cd *hivev1.ClusterDeployment, sshKey, pullSecret stri
 		platform.AWS = &installeraws.Platform{
 			Region:       aws.Region,
 			UserTags:     aws.UserTags,
-			VPCCIDRBlock: aws.VPCCIDRBlock,
+			VPCCIDRBlock: parseCIDR(aws.VPCCIDRBlock),
 		}
 		if aws.DefaultMachinePlatform != nil {
 			platform.AWS.DefaultMachinePlatform = &installeraws.MachinePool{
@@ -97,13 +96,9 @@ func GenerateInstallConfig(cd *hivev1.ClusterDeployment, sshKey, pullSecret stri
 		SSHKey:     sshKey,
 		BaseDomain: spec.Config.BaseDomain,
 		Networking: types.Networking{
-			Type: networkType,
-			ServiceCIDR: ipnet.IPNet{
-				IPNet: parseCIDR(spec.Config.Networking.ServiceCIDR),
-			},
-			PodCIDR: &ipnet.IPNet{
-				IPNet: parseCIDR(spec.Config.Networking.PodCIDR),
-			},
+			Type:        networkType,
+			ServiceCIDR: *parseCIDR(spec.Config.Networking.ServiceCIDR),
+			PodCIDR:     parseCIDR(spec.Config.Networking.PodCIDR),
 		},
 		PullSecret: pullSecret,
 		Platform:   platform,
@@ -112,12 +107,11 @@ func GenerateInstallConfig(cd *hivev1.ClusterDeployment, sshKey, pullSecret stri
 	return ic, nil
 }
 
-func parseCIDR(s string) net.IPNet {
+func parseCIDR(s string) *ipnet.IPNet {
 	if s == "" {
-		return net.IPNet{}
+		return &ipnet.IPNet{}
 	}
-	_, cidr, _ := net.ParseCIDR(s)
-	return *cidr
+	return ipnet.MustParseCIDR(s)
 }
 
 func convertNetworkingType(hnt hivev1.NetworkType) (netopv1.NetworkType, error) {

pkg/install/convertconfig_test.go

@@ -43,7 +43,6 @@ const (
 	adminPassword   = "adminpassword"
 	adminSSHKey     = "adminSSH"
 	pullSecret      = "pullSecret"
-	vpcCIDRBlock    = "10.1.0.0/16"
 	awsInstanceType = "fake-aws-type"
 	awsRegion       = "us-east-1"
 	iamRoleName     = "rolename"
@@ -52,6 +51,10 @@ const (
 	ec2VolType      = "sometype"
 )
 
+var (
+	vpcCIDRBlock = ipnet.MustParseCIDR("10.1.0.0/16")
+)
+
 func buildValidClusterDeployment() *hivev1.ClusterDeployment {
 	replicas := int64(3)
 	return &hivev1.ClusterDeployment{
@@ -71,7 +74,7 @@ func buildValidClusterDeployment() *hivev1.ClusterDeployment {
 						UserTags: map[string]string{
 							"foo": "bar",
 						},
-						VPCCIDRBlock: vpcCIDRBlock,
+						VPCCIDRBlock: vpcCIDRBlock.String(),
 						DefaultMachinePlatform: &hivev1.AWSMachinePoolPlatform{
 							InstanceType: awsInstanceType,
 							IAMRoleName:  iamRoleName,
@@ -137,13 +140,9 @@ func buildBaseExpectedInstallConfig() *installtypes.InstallConfig {
 		PullSecret: pullSecret,
 		Networking: installtypes.Networking{
 			// TODO: Hardcoded to match installer for now.
-			Type: "OpenshiftSDN",
-			ServiceCIDR: ipnet.IPNet{
-				IPNet: parseCIDR("172.30.0.0/16"),
-			},
-			PodCIDR: &ipnet.IPNet{
-				IPNet: parseCIDR("10.128.0.0/14"),
-			},
+			Type:        "OpenshiftSDN",
+			ServiceCIDR: *ipnet.MustParseCIDR("172.30.0.0/16"),
+			PodCIDR:     ipnet.MustParseCIDR("10.128.0.0/14"),
 		},
 		Platform: installtypes.Platform{
 			AWS: &installawstypes.Platform{