Stop calling unregisterWorkqueue which was removed in gerrit

Change-Id: I84d10ec4ccad8649b6a45a84f986a3cf1d44b0ab
diff --git a/src/main/java/com/ericsson/gerrit/plugins/syncevents/SyncEventExecutorProvider.java b/src/main/java/com/ericsson/gerrit/plugins/syncevents/SyncEventExecutorProvider.java
index 3ddec77..7fb0ab1 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/syncevents/SyncEventExecutorProvider.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/syncevents/SyncEventExecutorProvider.java
@@ -44,7 +44,6 @@
   @Override
   public void stop() {
     executor.shutdown();
-    executor.unregisterWorkQueue();
     executor = null;
   }
 
diff --git a/src/test/java/com/ericsson/gerrit/plugins/syncevents/SyncEventExecutorProviderTest.java b/src/test/java/com/ericsson/gerrit/plugins/syncevents/SyncEventExecutorProviderTest.java
index 676e028..faec7d1 100644
--- a/src/test/java/com/ericsson/gerrit/plugins/syncevents/SyncEventExecutorProviderTest.java
+++ b/src/test/java/com/ericsson/gerrit/plugins/syncevents/SyncEventExecutorProviderTest.java
@@ -56,7 +56,6 @@
     assertThat(syncEventsExecutorProvider.get()).isEqualTo(executorMock);
     syncEventsExecutorProvider.stop();
     verify(executorMock).shutdown();
-    verify(executorMock).unregisterWorkQueue();
     assertThat(syncEventsExecutorProvider.get()).isNull();
   }
 }