Move plugin type definitions to containerd plugins package

The plugins packages defines the plugins used by containerd.
Move all the types and properties to this package.

Signed-off-by: Derek McGowan <derek@mcg.dev>

snapshots/blockfile/plugin/plugin.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/containerd/containerd/platforms"
 	"github.com/containerd/containerd/plugin"
+	"github.com/containerd/containerd/plugins"
 	"github.com/containerd/containerd/snapshots/blockfile"
 )
 
@@ -45,7 +46,7 @@ type Config struct {
 
 func init() {
 	plugin.Register(&plugin.Registration{
-		Type:   plugin.SnapshotPlugin,
+		Type:   plugins.SnapshotPlugin,
 		ID:     "blockfile",
 		Config: &Config{},
 		InitFn: func(ic *plugin.InitContext) (interface{}, error) {

snapshots/btrfs/plugin/plugin.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/containerd/containerd/platforms"
 	"github.com/containerd/containerd/plugin"
+	"github.com/containerd/containerd/plugins"
 	"github.com/containerd/containerd/snapshots/btrfs"
 )
 
@@ -37,7 +38,7 @@ type Config struct {
 func init() {
 	plugin.Register(&plugin.Registration{
 		ID:     "btrfs",
-		Type:   plugin.SnapshotPlugin,
+		Type:   plugins.SnapshotPlugin,
 		Config: &Config{},
 		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
 			ic.Meta.Platforms = []ocispec.Platform{platforms.DefaultSpec()}

snapshots/devmapper/plugin/plugin.go

@@ -24,12 +24,13 @@ import (
 
 	"github.com/containerd/containerd/platforms"
 	"github.com/containerd/containerd/plugin"
+	"github.com/containerd/containerd/plugins"
 	"github.com/containerd/containerd/snapshots/devmapper"
 )
 
 func init() {
 	plugin.Register(&plugin.Registration{
-		Type:   plugin.SnapshotPlugin,
+		Type:   plugins.SnapshotPlugin,
 		ID:     "devmapper",
 		Config: &devmapper.Config{},
 		InitFn: func(ic *plugin.InitContext) (interface{}, error) {

snapshots/lcow/lcow.go

@@ -37,6 +37,7 @@ import (
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/mount"
 	"github.com/containerd/containerd/plugin"
+	"github.com/containerd/containerd/plugins"
 	"github.com/containerd/containerd/snapshots"
 	"github.com/containerd/containerd/snapshots/storage"
 	"github.com/containerd/continuity/fs"
@@ -46,7 +47,7 @@ import (
 
 func init() {
 	plugin.Register(&plugin.Registration{
-		Type: plugin.SnapshotPlugin,
+		Type: plugins.SnapshotPlugin,
 		ID:   "windows-lcow",
 		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
 			ic.Meta.Platforms = append(ic.Meta.Platforms, ocispec.Platform{

snapshots/native/plugin/plugin.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/containerd/containerd/platforms"
 	"github.com/containerd/containerd/plugin"
+	"github.com/containerd/containerd/plugins"
 	"github.com/containerd/containerd/snapshots/native"
 )
 
@@ -32,7 +33,7 @@ type Config struct {
 
 func init() {
 	plugin.Register(&plugin.Registration{
-		Type:   plugin.SnapshotPlugin,
+		Type:   plugins.SnapshotPlugin,
 		ID:     "native",
 		Config: &Config{},
 		InitFn: func(ic *plugin.InitContext) (interface{}, error) {

snapshots/overlay/plugin/plugin.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/containerd/containerd/platforms"
 	"github.com/containerd/containerd/plugin"
+	"github.com/containerd/containerd/plugins"
 	"github.com/containerd/containerd/snapshots/overlay"
 	"github.com/containerd/containerd/snapshots/overlay/overlayutils"
 )
@@ -50,7 +51,7 @@ type Config struct {
 
 func init() {
 	plugin.Register(&plugin.Registration{
-		Type:   plugin.SnapshotPlugin,
+		Type:   plugins.SnapshotPlugin,
 		ID:     "overlayfs",
 		Config: &Config{},
 		InitFn: func(ic *plugin.InitContext) (interface{}, error) {

snapshots/windows/windows.go

@@ -38,6 +38,7 @@ import (
 	"github.com/containerd/containerd/mount"
 	"github.com/containerd/containerd/platforms"
 	"github.com/containerd/containerd/plugin"
+	"github.com/containerd/containerd/plugins"
 	"github.com/containerd/containerd/snapshots"
 	"github.com/containerd/containerd/snapshots/storage"
 	"github.com/containerd/continuity/fs"
@@ -47,7 +48,7 @@ import (
 
 func init() {
 	plugin.Register(&plugin.Registration{
-		Type: plugin.SnapshotPlugin,
+		Type: plugins.SnapshotPlugin,
 		ID:   "windows",
 		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
 			ic.Meta.Platforms = []ocispec.Platform{platforms.DefaultSpec()}