convert restorers to plugins

Signed-off-by: Steve Kriss <steve@heptio.com>

pkg/util/logging/log_setter.go

@@ -0,0 +1,9 @@
+package logging
+
+import "github.com/sirupsen/logrus"
+
+// LogSetter is an interface for a type that allows a FieldLogger
+// to be set on it.
+type LogSetter interface {
+	SetLog(logrus.FieldLogger)
+}