Update checkstyle to version 6.19

Change-Id: I32787f2a5f4f4b17fd4cdcf9bd2eb3903dcecfff
diff --git a/core/common/src/test/java/org/onosproject/codec/impl/FlowRuleCodecTest.java b/core/common/src/test/java/org/onosproject/codec/impl/FlowRuleCodecTest.java
index 11df9a1..fb1ff08 100644
--- a/core/common/src/test/java/org/onosproject/codec/impl/FlowRuleCodecTest.java
+++ b/core/common/src/test/java/org/onosproject/codec/impl/FlowRuleCodecTest.java
@@ -360,8 +360,7 @@
         checkCommonData(rule);
 
         rule.treatment().allInstructions()
-                .forEach(instruction ->
-                {
+                .forEach(instruction -> {
                     String subType;
                     if (instruction.type() == Instruction.Type.L0MODIFICATION) {
                         subType = ((L0ModificationInstruction) instruction)
diff --git a/core/common/src/test/java/org/onosproject/store/trivial/SimpleGroupStore.java b/core/common/src/test/java/org/onosproject/store/trivial/SimpleGroupStore.java
index f3f0bd7..c55d009 100644
--- a/core/common/src/test/java/org/onosproject/store/trivial/SimpleGroupStore.java
+++ b/core/common/src/test/java/org/onosproject/store/trivial/SimpleGroupStore.java
@@ -416,7 +416,7 @@
                     Optional<GroupBucket> matchingBucket =
                             existing.buckets().buckets()
                             .stream()
-                            .filter((existingBucket)->(existingBucket.equals(bucket)))
+                            .filter((existingBucket) -> (existingBucket.equals(bucket)))
                             .findFirst();
                     if (matchingBucket.isPresent()) {
                         ((StoredGroupBucketEntry) matchingBucket.
diff --git a/core/store/dist/src/main/java/org/onosproject/store/statistic/impl/DistributedFlowStatisticStore.java b/core/store/dist/src/main/java/org/onosproject/store/statistic/impl/DistributedFlowStatisticStore.java
index 8bfbf09..75600e7 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/statistic/impl/DistributedFlowStatisticStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/statistic/impl/DistributedFlowStatisticStore.java
@@ -197,10 +197,14 @@
 
         // create one if absent and add this rule
         current.putIfAbsent(cp, new HashSet<>());
-        current.computeIfPresent(cp, (c, e) -> { e.add(rule); return e; });
+        current.computeIfPresent(cp, (c, e) -> {
+            e.add(rule); return e;
+        });
 
         // remove previous one if present
-        previous.computeIfPresent(cp, (c, e) -> { e.remove(rule); return e; });
+        previous.computeIfPresent(cp, (c, e) -> {
+            e.remove(rule); return e;
+        });
     }
 
     @Override
diff --git a/core/store/primitives/src/test/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMapTest.java b/core/store/primitives/src/test/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMapTest.java
index a3e75a3..f27148e 100644
--- a/core/store/primitives/src/test/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMapTest.java
+++ b/core/store/primitives/src/test/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentTreeMapTest.java
@@ -117,7 +117,7 @@
                                 result.value())).join());
         //test all compute methods in this section
         allKeys.forEach(key -> map.computeIfAbsent(
-                key, v ->allValues.get(allKeys.indexOf(key)
+                key, v -> allValues.get(allKeys.indexOf(key)
                 )).thenAccept(result ->
                                 assertArrayEquals(
                                         allValues.get(allKeys.indexOf(key)),
@@ -657,4 +657,4 @@
             return 0;
         }
     }
-}
\ No newline at end of file
+}