Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  Upgrade bazlets to latest stable-2.15 to build with 2.15.19 API
  Upgrade bazlets to latest stable-2.14 to build with 2.14.21 API

Change-Id: I1f4ae1b4a273281b1601d6f4c75ccbc8c896aa22
diff --git a/.bazelversion b/.bazelversion
index 9084fa2..fd2a018 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-1.1.0
+3.1.0
diff --git a/WORKSPACE b/WORKSPACE
index c6164e0..5169df2 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "9af263722b7eafe99af079d6ef7cf1de23e6f8d7",
+    commit = "fff6f20bb2eceaf872a8acf8ad51471c25a82d38",
     #local_path = "/home/<user>/projects/bazlets"
 )
 
diff --git a/src/main/java/com/cisco/gerrit/plugins/slack/PublishEventListener.java b/src/main/java/com/cisco/gerrit/plugins/slack/PublishEventListener.java
index f0988d1..148d15a 100644
--- a/src/main/java/com/cisco/gerrit/plugins/slack/PublishEventListener.java
+++ b/src/main/java/com/cisco/gerrit/plugins/slack/PublishEventListener.java
@@ -21,13 +21,13 @@
 import com.cisco.gerrit.plugins.slack.config.ProjectConfig;
 import com.cisco.gerrit.plugins.slack.message.MessageGenerator;
 import com.cisco.gerrit.plugins.slack.message.MessageGeneratorFactory;
-import com.google.gerrit.common.EventListener;
 import com.google.gerrit.extensions.annotations.Listen;
 import com.google.gerrit.server.config.AllProjectsName;
 import com.google.gerrit.server.config.PluginConfigFactory;
 import com.google.gerrit.server.events.ChangeMergedEvent;
 import com.google.gerrit.server.events.CommentAddedEvent;
 import com.google.gerrit.server.events.Event;
+import com.google.gerrit.server.events.EventListener;
 import com.google.gerrit.server.events.PatchSetCreatedEvent;
 import com.google.gerrit.server.events.ReviewerAddedEvent;
 import com.google.gerrit.server.events.WorkInProgressStateChangedEvent;
diff --git a/src/test/java/com/cisco/gerrit/plugins/slack/PublishEventListenerTest.java b/src/test/java/com/cisco/gerrit/plugins/slack/PublishEventListenerTest.java
index d672922..c5ab66a 100644
--- a/src/test/java/com/cisco/gerrit/plugins/slack/PublishEventListenerTest.java
+++ b/src/test/java/com/cisco/gerrit/plugins/slack/PublishEventListenerTest.java
@@ -22,14 +22,10 @@
 
 import com.google.gerrit.server.config.AllProjectsName;
 import com.google.gerrit.server.config.PluginConfigFactory;
-import com.google.gerrit.server.events.ChangeMergedEvent;
-import com.google.gerrit.server.events.PatchSetCreatedEvent;
 import org.junit.Before;
 import org.junit.Test;
 
 public class PublishEventListenerTest {
-  private PatchSetCreatedEvent mockPatchSetCreatedEvent = mock(PatchSetCreatedEvent.class);
-  private ChangeMergedEvent mockChangeMergedEvent = mock(ChangeMergedEvent.class);
   private PluginConfigFactory mockConfigFactory = mock(PluginConfigFactory.class);
   private AllProjectsName mockAllProjectsName = mock(AllProjectsName.class);