Merge branch 'stable-3.3' into stable-3.4

* stable-3.3:
  Introduce zookeeper-refdb init step
  Bump zookeeper and netty versions
  Bazel: Format BUILD file with buildifier

Change-Id: I9a70086b400cbf873e28f892e77b67a3234ec41a

external_plugin_deps.bzl

diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index 2eb7221..2109189 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -53,6 +53,6 @@
 
     maven_jar(
         name = "global-refdb",
-        artifact = "com.gerritforge:global-refdb:3.3.0",
-        sha1 = "8ef0600757b7468dc023c5030ce2cfeaa8ea0b64",
+        artifact = "com.gerritforge:global-refdb:3.4.0",
+        sha1 = "a1c7b02ddabe0dd0a989fb30ca18b61fe95ee894",
     )