HDDS-1296. Fix checkstyle issue from Nightly run. Contributed by Xiaoyu Yao. (#616)

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OmKeyLocationInfo.java

@@ -123,6 +123,7 @@ public final class OmKeyLocationInfo {
       return this;
     }
 
+    @SuppressWarnings("checkstyle:hiddenfield")
     public Builder setPipeline(Pipeline pipeline) {
       this.pipeline = pipeline;
       return this;

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/KeyManagerImpl.java

@@ -96,8 +96,6 @@ import static org.apache.hadoop.util.Time.monotonicNow;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.ws.rs.HEAD;
-
 /**
  * Implementation of keyManager.
  */
@@ -163,8 +161,8 @@ public class KeyManagerImpl implements KeyManager {
           OZONE_BLOCK_DELETING_SERVICE_TIMEOUT,
           OZONE_BLOCK_DELETING_SERVICE_TIMEOUT_DEFAULT,
           TimeUnit.MILLISECONDS);
-      keyDeletingService = new KeyDeletingService(scmClient.getBlockClient(), this,
-          blockDeleteInterval, serviceTimeout, configuration);
+      keyDeletingService = new KeyDeletingService(scmClient.getBlockClient(),
+          this, blockDeleteInterval, serviceTimeout, configuration);
       keyDeletingService.start();
     }
   }

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/ScmClient.java

@@ -35,7 +35,7 @@ public class ScmClient {
   }
 
   ScmBlockLocationProtocol getBlockClient() {
-     return this.blockClient;
+    return this.blockClient;
   }
 
   StorageContainerLocationProtocol getContainerClient() {