Fix checkstyle errors

Author: Aditya Deshpande

hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/impl/AWSClientConfig.java

@@ -450,7 +450,8 @@ private static void initRequestHeaders(Configuration conf,
         if (!headerValues.isEmpty()) {
           clientConfig.putHeader(header, headerValues);
         } else {
-          LOG.warn("Ignoring header '{}' for {} client because no values were provided", header, awsServiceIdentifier);
+          LOG.warn("Ignoring header '{}' for {} client because no values were provided",
+                  header, awsServiceIdentifier);
         }
       });
       LOG.debug("headers for {} client = {}", awsServiceIdentifier, clientConfig.headers());

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/impl/TestAwsClientConfig.java

@@ -279,7 +279,8 @@ public void testInitRequestHeadersForS3() throws IOException {
 
   /**
    * if {@link org.apache.hadoop.fs.s3a.Constants#CUSTOM_HEADERS_S3} is set,
-   * verify that returned client configuration has desired headers set with whitespaces trimmed for headers and values.
+   * verify that returned client configuration has desired headers set with
+   * whitespaces trimmed for headers and values.
    */
   @Test
   public void testInitRequestHeadersForS3WithWhitespace() throws IOException {