Merge branch 'stable-2.15'

* stable-2.15:
  NoteDbMigrator: Set checkExisting(false) on PackInserter
  ChangeRebuilderImpl: Fail when new NoteDb state is null
  PrimaryStorageMigrator: Log individual migrations at debug
  Document the deprecation of old change IDs
  Update JGit to get PackInserter fix
  AbstractChangeNotes: Never open repo when NoteDb is off
  MigrateToNoteDb: Only reindex change index
  PolyGerrit: Add background-repeat to gr-main-header
  Revert "Add privateByDefault config to /config/server/info"
  Private state changed event
  WIP state changed event
  Populate ChangeAttribute with WIP and private status.
  Fix invalid json example in POST access endpoint
  Add default values in create project dialog and group config
  Update JGit to 4.9.2.201712150930-r
  gerrit_plugin: Don't add Implementation-Vendor manifest entry
  Fix schema_154 migration from version 2.13 and older
  Default to writing comments in JSON format

Change-Id: Iee55a0f00ce2430cd400c64491acde3651a0390d

java/com/google/gerrit/server/data/ChangeAttribute.java

@@ -16,6 +16,7 @@ package com.google.gerrit.server.data;
 
 import com.google.gerrit.extensions.common.PluginDefinedInfo;
 import com.google.gerrit.reviewdb.client.Change;
+import com.google.gson.annotations.SerializedName;
 import java.util.List;
 
 public class ChangeAttribute {
@@ -35,6 +36,10 @@ public class ChangeAttribute {
   public Boolean open;
   public Change.Status status;
   public List<MessageAttribute> comments;
+  public Boolean wip;
+
+  @SerializedName("private")
+  public Boolean isPrivate;
 
   public List<TrackingIdAttribute> trackingIds;
   public PatchSetAttribute currentPatchSet;