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/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;