use plugin registry and prepare for conversion (#1003)

* use plugin registry and prepare for conersion

* Register plugins explicitly to a registry

* check interface impl instead of struc var

* setup plugins at top level

* treat plugin type combinations

* pass registry as arg of V1alpha1ToInternal

* move registry yet another level up

* check interface type separately

pkg/framework/plugins/podlifetime/types.go

@@ -23,10 +23,10 @@ import (
 
 // PodLifeTimeArgs holds arguments used to configure PodLifeTime plugin.
 type PodLifeTimeArgs struct {
-	metav1.TypeMeta
+	metav1.TypeMeta `json:",inline"`
 
-	Namespaces            *api.Namespaces
-	LabelSelector         *metav1.LabelSelector
-	MaxPodLifeTimeSeconds *uint
-	States                []string
+	Namespaces            *api.Namespaces       `json:"namespaces"`
+	LabelSelector         *metav1.LabelSelector `json:"labelSelector"`
+	MaxPodLifeTimeSeconds *uint                 `json:"maxPodLifeTimeSeconds"`
+	States                []string              `json:"states"`
 }