Issue #2619: Use Nexus Staging Maven Plugin for release process

pom.xml

@@ -579,6 +579,20 @@
         <artifactId>maven-deploy-plugin</artifactId>
         <version>2.8.2</version>
       </plugin>
+      <plugin>
+          <groupId>org.sonatype.plugins</groupId>
+          <artifactId>nexus-staging-maven-plugin</artifactId>
+          <version>1.6.6</version>
+          <extensions>true</extensions>
+          <configuration>
+              <!-- serverId is ID of a <server> section from Maven's settings.xml
+                   to pick authentication information from
+              -->
+              <serverId>sonatype-nexus-staging</serverId>
+              <nexusUrl>https://oss.sonatype.org/</nexusUrl>
+              <autoReleaseAfterClose>true</autoReleaseAfterClose>
+          </configuration>
+      </plugin>
 
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>