HADOOP-15334. Upgrade Maven surefire plugin. Contributed by Arpit Agarwal.

hadoop-project/pom.xml

@@ -111,7 +111,7 @@
 
     <!-- Plugin versions and config -->
     <maven-surefire-plugin.argLine>-Xmx2048m -XX:MaxPermSize=768m -XX:+HeapDumpOnOutOfMemoryError</maven-surefire-plugin.argLine>
-    <maven-surefire-plugin.version>2.20.1</maven-surefire-plugin.version>
+    <maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.version>
     <maven-surefire-report-plugin.version>${maven-surefire-plugin.version}</maven-surefire-report-plugin.version>
     <maven-failsafe-plugin.version>${maven-surefire-plugin.version}</maven-failsafe-plugin.version>