HADOOP-15177. Update the release year to 2018. Contributed by Bharat Viswanadham.

(cherry picked from commit cdaf92c9f57560219b8f915a19ad8603ddf2a505)
(cherry picked from commit b0c9b89281c9264c70ae79b1e4830e0fa2411b4f)

hadoop-project/pom.xml

@@ -31,7 +31,7 @@
 
   <properties>
     <!-- Set the Release year during release -->
-    <release-year>2017</release-year>
+    <release-year>2018</release-year>
 
     <failIfNoTests>false</failIfNoTests>
     <maven.test.redirectTestOutputToFile>true</maven.test.redirectTestOutputToFile>