Switch to github.com/containerd/plugin

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

plugin/context.go

@@ -51,8 +51,8 @@ func NewContext(ctx context.Context, plugins *Set, properties map[string]string)
 	}
 }
 
-// Get returns the first plugin by its type
-func (i *InitContext) Get(t Type) (interface{}, error) {
+// GetSingle returns the first plugin by its type
+func (i *InitContext) GetSingle(t Type) (interface{}, error) {
 	return i.plugins.Get(t)
 }