Stop calling unregisterWorkqueue which was removed in gerrit

Change-Id: Ibdc7f7e61a8b64a8a5e79ed3f7add1ff3ad91d3d
diff --git a/src/main/java/com/ericsson/gerrit/plugins/syncindex/SyncIndexExecutorProvider.java b/src/main/java/com/ericsson/gerrit/plugins/syncindex/SyncIndexExecutorProvider.java
index 0400506..7a53fbe 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/syncindex/SyncIndexExecutorProvider.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/syncindex/SyncIndexExecutorProvider.java
@@ -41,7 +41,6 @@
   @Override
   public void stop() {
     executor.shutdown();
-    executor.unregisterWorkQueue();
     executor = null;
   }
 
diff --git a/src/test/java/com/ericsson/gerrit/plugins/syncindex/SyncIndexExecutorProviderTest.java b/src/test/java/com/ericsson/gerrit/plugins/syncindex/SyncIndexExecutorProviderTest.java
index a48dd9b..3833883 100644
--- a/src/test/java/com/ericsson/gerrit/plugins/syncindex/SyncIndexExecutorProviderTest.java
+++ b/src/test/java/com/ericsson/gerrit/plugins/syncindex/SyncIndexExecutorProviderTest.java
@@ -56,7 +56,6 @@
     assertThat(syncIndexExecutorProvider.get()).isEqualTo(executorMock);
     syncIndexExecutorProvider.stop();
     verify(executorMock).shutdown();
-    verify(executorMock).unregisterWorkQueue();
     assertThat(syncIndexExecutorProvider.get()).isNull();
   }
 }