Split out windows-slaves-plugin.

https://trello.com/c/MhG9Ksqa/12-windows-service-slave-launcher

core/src/main/java/hudson/ClassicPluginStrategy.java

@@ -272,7 +272,8 @@ public class ClassicPluginStrategy implements PluginStrategy {
         new DetachedPlugin("ldap","1.467.*","1.0"),
         new DetachedPlugin("pam-auth","1.467.*","1.0"),
         new DetachedPlugin("mailer","1.493.*","1.2"),
-        new DetachedPlugin("matrix-auth","1.535.*","1.0.2")
+        new DetachedPlugin("matrix-auth","1.535.*","1.0.2"),
+        new DetachedPlugin("windows-slaves","1.547.*","1.0")
     );
 
     /**