Suppress SpotBugs unwritten-field warnings on ZooKeeperAwaitStrategy

The `cube` and `dockerClientExecutor` fields are populated by Arquillian
via reflection. Removing the SLF4J `LOG` field as part of the slog
conversion left those fields as the only declared instance state, which
SpotBugs now flags as UWF_UNWRITTEN_FIELD / NP_UNWRITTEN_FIELD.
Annotate the class to suppress these warnings.

Author: merlimat

tests/integration-tests-utils/src/main/java/org/apache/bookkeeper/tests/integration/utils/ZooKeeperAwaitStrategy.java

@@ -17,6 +17,7 @@
  */
 package org.apache.bookkeeper.tests.integration.utils;
 
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import java.util.concurrent.TimeUnit;
 import org.arquillian.cube.docker.impl.docker.DockerClientExecutor;
 import org.arquillian.cube.docker.impl.util.Ping;
@@ -27,6 +28,8 @@
 /**
  * An arquillian await strategy that waits until zookeeper is up running.
  */
+// `cube` and `dockerClientExecutor` are injected by Arquillian via reflection.
+@SuppressFBWarnings({"UWF_UNWRITTEN_FIELD", "NP_UNWRITTEN_FIELD"})
 public class ZooKeeperAwaitStrategy implements AwaitStrategy {
 
     private static final int DEFAULT_POLL_ITERATIONS = 10;