Add API config to node set

This moves API handling into the node object so now everything can be
done in one place.

TLS is required.
In the current form, auth must be setup by the caller.

node/nodeutil/provider.go

@@ -0,0 +1,47 @@
+package nodeutil
+
+import (
+	"context"
+	"io"
+
+	"github.com/virtual-kubelet/virtual-kubelet/node"
+	"github.com/virtual-kubelet/virtual-kubelet/node/api"
+	"github.com/virtual-kubelet/virtual-kubelet/node/api/statsv1alpha1"
+	v1 "k8s.io/api/core/v1"
+	corev1listers "k8s.io/client-go/listers/core/v1"
+)
+
+// Provider contains the methods required to implement a virtual-kubelet provider.
+//
+// Errors produced by these methods should implement an interface from
+// github.com/virtual-kubelet/virtual-kubelet/errdefs package in order for the
+// core logic to be able to understand the type of failure
+type Provider interface {
+	node.PodLifecycleHandler
+
+	// GetContainerLogs retrieves the logs of a container by name from the provider.
+	GetContainerLogs(ctx context.Context, namespace, podName, containerName string, opts api.ContainerLogOpts) (io.ReadCloser, error)
+
+	// RunInContainer executes a command in a container in the pod, copying data
+	// between in/out/err and the container's stdin/stdout/stderr.
+	RunInContainer(ctx context.Context, namespace, podName, containerName string, cmd []string, attach api.AttachIO) error
+
+	// GetStatsSummary gets the stats for the node, including running pods
+	GetStatsSummary(context.Context) (*statsv1alpha1.Summary, error)
+}
+
+// ProviderConfig holds objects created by NewNodeFromClient that a provider may need to bootstrap itself.
+type ProviderConfig struct {
+	Pods       corev1listers.PodLister
+	ConfigMaps corev1listers.ConfigMapLister
+	Secrets    corev1listers.SecretLister
+	Services   corev1listers.ServiceLister
+	// Hack to allow the provider to set things on the node
+	// Since the provider is bootstrapped after the node object is configured
+	// Primarily this is due to carry-over from the pre-1.0 interfaces that expect the provider instead of the direct *caller* to configure the node.
+	Node *v1.Node
+}
+
+// NewProviderFunc is used from NewNodeFromClient to bootstrap a provider using the client/listers/etc created there.
+// If a nil node provider is returned a default one will be used.
+type NewProviderFunc func(ProviderConfig) (Provider, node.NodeProvider, error)