HADOOP-16491. Upgrade jetty version to 9.3.27. Contributed by Hrishikesh Gadre.

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>

hadoop-project/pom.xml

@@ -35,7 +35,7 @@
 
     <failIfNoTests>false</failIfNoTests>
     <maven.test.redirectTestOutputToFile>true</maven.test.redirectTestOutputToFile>
-    <jetty.version>9.3.24.v20180605</jetty.version>
+    <jetty.version>9.3.27.v20190418</jetty.version>
     <test.exclude>_</test.exclude>
     <test.exclude.pattern>_</test.exclude.pattern>