Update checkstyle to 8.10

- fix issues detected
  - YANG custom registrator should be subject to checkstyle
  - fix Java 8 syntax related violations

Change-Id: I0fc52c6612a40d851fd9bc3bf019621776b1f92a
diff --git a/models/ciena/waveserverai/src/main/java/org/onosproject/models/ciena/waveserverai/CienaWaveserverAiModelRegistrator.java b/models/ciena/waveserverai/src/main/java/org/onosproject/models/ciena/waveserverai/CienaWaveserverAiModelRegistrator.java
index f986281..257428d 100644
--- a/models/ciena/waveserverai/src/main/java/org/onosproject/models/ciena/waveserverai/CienaWaveserverAiModelRegistrator.java
+++ b/models/ciena/waveserverai/src/main/java/org/onosproject/models/ciena/waveserverai/CienaWaveserverAiModelRegistrator.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.onosproject.models.ciena;
+package org.onosproject.models.ciena.waveserverai;
 
 import com.google.common.collect.ImmutableMap;
 import org.onosproject.yang.AbstractYangModelRegistrator;
@@ -26,8 +26,6 @@
 import org.onosproject.yang.runtime.AppModuleInfo;
 import org.onosproject.yang.runtime.DefaultAppModuleInfo;
 
-import java.util.List;
-import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Map;
 
diff --git a/models/ciena/waveserverai/src/main/java/org/onosproject/models/ciena/waveserverai/package-info.java b/models/ciena/waveserverai/src/main/java/org/onosproject/models/ciena/waveserverai/package-info.java
index fd62c24..0b5cc91 100644
--- a/models/ciena/waveserverai/src/main/java/org/onosproject/models/ciena/waveserverai/package-info.java
+++ b/models/ciena/waveserverai/src/main/java/org/onosproject/models/ciena/waveserverai/package-info.java
@@ -14,6 +14,6 @@
  * limitations under the License.
  */
 /**
- * Yang models for Ciena Waveserver Ai
+ * Yang models for Ciena Waveserver Ai.
  */
 package org.onosproject.models.ciena.waveserverai;