Client go upgrade v6 (#352)

There are shortcuts in this code, i.e. we created the deepcopy function
by using the deepcopy package instead of the generated code, that will
be addressed once migrated to client-go v8. Also, some objects,
particularly statefulsets, are still taken from v1beta, this will also
be addressed in further commits once the changes are stabilized.

pkg/util/config/crd_config.go

@@ -6,6 +6,8 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
 	"github.com/zalando-incubator/postgres-operator/pkg/spec"
+	"github.com/mohae/deepcopy"
+	"k8s.io/apimachinery/pkg/runtime"
 )
 
 type OperatorConfiguration struct {
@@ -160,3 +162,46 @@ func (opcl *OperatorConfigurationList) UnmarshalJSON(data []byte) error {
 	*opcl = OperatorConfigurationList(ref)
 	return nil
 }
+
+func (in *OperatorConfiguration) DeepCopyInto(out *OperatorConfiguration) {
+	if in != nil {
+		out = deepcopy.Copy(in).(*OperatorConfiguration)
+	}
+	return
+}
+
+func (in *OperatorConfiguration) DeepCopy() *OperatorConfiguration {
+	if in == nil { return nil }
+	out := new(OperatorConfiguration)
+	in.DeepCopyInto(out)
+	return out
+}
+
+func (in *OperatorConfiguration) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+func (in *OperatorConfigurationList) DeepCopyInto(out *OperatorConfigurationList) {
+	if in != nil {
+		out = deepcopy.Copy(in).(*OperatorConfigurationList)
+	}
+	return
+}
+
+func (in *OperatorConfigurationList) DeepCopy() *OperatorConfigurationList {
+	if in == nil { return nil }
+	out := new(OperatorConfigurationList)
+	in.DeepCopyInto(out)
+	return out
+}
+
+func (in *OperatorConfigurationList) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+

pkg/util/k8sutil/k8sutil.go

@@ -4,19 +4,19 @@ import (
 	"fmt"
 	"reflect"
 
+	"k8s.io/api/core/v1"
+	policybeta1 "k8s.io/api/policy/v1beta1"
 	apiextclient "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
 	apiextbeta1 "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/typed/apiextensions/v1beta1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/runtime/serializer"
 	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/kubernetes/scheme"
 	"k8s.io/client-go/kubernetes/typed/apps/v1beta1"
 	v1core "k8s.io/client-go/kubernetes/typed/core/v1"
 	policyv1beta1 "k8s.io/client-go/kubernetes/typed/policy/v1beta1"
 	rbacv1beta1 "k8s.io/client-go/kubernetes/typed/rbac/v1beta1"
-	"k8s.io/client-go/pkg/api"
-	"k8s.io/client-go/pkg/api/v1"
-	policybeta1 "k8s.io/client-go/pkg/apis/policy/v1beta1"
 	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/clientcmd"
 
@@ -93,7 +93,8 @@ func NewFromConfig(cfg *rest.Config) (KubernetesClient, error) {
 		Version: constants.CRDApiVersion,
 	}
 	cfg2.APIPath = constants.K8sAPIPath
-	cfg2.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: api.Codecs}
+	// MIGRATION: api.codecs -> scheme.Codecs?
+	cfg2.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: scheme.Codecs}
 
 	crd, err := rest.RESTClientFor(&cfg2)
 	if err != nil {

pkg/util/patroni/patroni.go

@@ -9,7 +9,7 @@ import (
 	"time"
 
 	"github.com/Sirupsen/logrus"
-	"k8s.io/client-go/pkg/api/v1"
+	"k8s.io/api/core/v1"
 )
 
 const (

pkg/util/volumes/ebs.go

@@ -7,7 +7,7 @@ import (
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/ec2"
-	"k8s.io/client-go/pkg/api/v1"
+	"k8s.io/api/core/v1"
 
 	"github.com/zalando-incubator/postgres-operator/pkg/util/constants"
 	"github.com/zalando-incubator/postgres-operator/pkg/util/retryutil"

pkg/util/volumes/volumes.go

@@ -1,7 +1,7 @@
 package volumes
 
 import (
-	"k8s.io/client-go/pkg/api/v1"
+	"k8s.io/api/core/v1"
 )
 
 // VolumeResizer defines the set of methods used to implememnt provider-specific resizing of persistent volumes.