Convert the annotations to their kotlin equivalents.

Author: nedtwigg

atplug-runtime/src/main/java/com/diffplug/atplug/Metadata.kt

@@ -7,12 +7,10 @@
 package com.diffplug.atplug
 
 import java.lang.annotation.Documented
-import java.lang.annotation.Retention
-import java.lang.annotation.RetentionPolicy
 
 /** Marks that a method is used to generate metadata, and should therefore return a constant. */
 @Documented
-@Retention(RetentionPolicy.SOURCE)
+@kotlin.annotation.Retention(AnnotationRetention.SOURCE)
 @Target(
 		AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER)
 annotation class Metadata

atplug-runtime/src/main/java/com/diffplug/atplug/Plug.kt

@@ -6,16 +6,10 @@
  */
 package com.diffplug.atplug
 
-import java.lang.annotation.Retention
-import java.lang.annotation.RetentionPolicy
 import kotlin.reflect.KClass
 
-/**
- * Annotation which signals that this class implements the given socket.
- *
- * We should name this autOSGi
- */
-@Retention(RetentionPolicy.CLASS)
+/** Annotation which signals that this class implements the given socket. */
+@kotlin.annotation.Retention(AnnotationRetention.BINARY)
 @Target(AnnotationTarget.ANNOTATION_CLASS, AnnotationTarget.CLASS)
 annotation class Plug(
 		/** Socket type which this plug implements. */