Merge branch 'stable-2.15'

* stable-2.15:
  CommandExecutorQueueProvider: Fix singleton binding
  ReviewerinPredicate: Only return users in state REVIEWER
  Remove documentation about cleaning the build cache
  AbstractQueryChangesTest#reviewerin: Expand to cover CC

Change-Id: I8bc29e2635480ab975bc1a474b333f048bce4eae

java/com/google/gerrit/sshd/SshModule.java

@@ -89,7 +89,7 @@ public class SshModule extends LifecycleModule {
         .annotatedWith(StreamCommandExecutor.class)
         .toProvider(StreamCommandExecutorProvider.class)
         .in(SINGLETON);
-    bind(QueueProvider.class).to(CommandExecutorQueueProvider.class).in(SINGLETON);
+    bind(QueueProvider.class).to(CommandExecutorQueueProvider.class);
 
     bind(GSSAuthenticator.class).to(GerritGSSAuthenticator.class);
     bind(PublickeyAuthenticator.class).to(CachingPublicKeyAuthenticator.class);