Sync plugin versions for build-conf

- apply checkstyle to self

Change-Id: Ib2b429bfbef0a273fe949f312875e8906d2b0310
diff --git a/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckDaemon.java b/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckDaemon.java
index f3166b1..a253995 100644
--- a/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckDaemon.java
+++ b/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckDaemon.java
@@ -46,7 +46,7 @@
  */
 public final class BuckDaemon {
 
-    private static long POLLING_INTERVAL = 1000; //ms
+    private static final long POLLING_INTERVAL = 1000; //ms
 
     private final Map<String, BuckTask> tasks = new HashMap<>();
     private final String portLock;
@@ -62,6 +62,8 @@
      * Main entry point for the daemon.
      *
      * @param args command-line arguments
+     * @throws CheckstyleException on checkstyle error
+     * @throws IOException on I/O error
      */
     public static void main(String[] args)
             throws CheckstyleException, IOException {
diff --git a/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckTask.java b/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckTask.java
index 50f079d..d579305 100644
--- a/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckTask.java
+++ b/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckTask.java
@@ -17,7 +17,7 @@
 package org.onosproject.buckdaemon;
 
 /**
- * Abstraction of a Buck task that can be spawned by the Buck daemon
+ * Abstraction of a Buck task that can be spawned by the Buck daemon.
  */
 public interface BuckTask {
 
diff --git a/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckTaskContext.java b/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckTaskContext.java
index 2cfb35d..8dabfd2 100644
--- a/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckTaskContext.java
+++ b/tools/build/conf/src/main/java/org/onosproject/buckdaemon/BuckTaskContext.java
@@ -25,8 +25,6 @@
 import java.io.InputStreamReader;
 import java.util.List;
 
-import static com.google.common.base.Preconditions.checkArgument;
-
 /**
  * Context for executing a single Buck task.
  */
@@ -74,6 +72,8 @@
 
     /**
      * Returns the symbolic task name.
+     *
+     * @return symbolic task name
      */
     public String taskName() {
         return taskName;
diff --git a/tools/build/conf/src/main/java/org/onosproject/checkstyle/package-info.java b/tools/build/conf/src/main/java/org/onosproject/checkstyle/package-info.java
new file mode 100644
index 0000000..241a819
--- /dev/null
+++ b/tools/build/conf/src/main/java/org/onosproject/checkstyle/package-info.java
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * checkstyle runner for BuckDaemon.
+ */
+package org.onosproject.checkstyle;