Add dependency to enable site generation for benchmark module

Change-Id: Iae4524ddc730d57993e9c6d6807282e4b07d1336
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.benchmarks/pom.xml

@@ -189,6 +189,33 @@
             </lifecycleMappingMetadata>
           </configuration>
         </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-site-plugin</artifactId>
+          <version>3.8.2</version>
+          <dependencies>
+            <dependency><!-- add support for ssh/scp -->
+              <groupId>org.apache.maven.wagon</groupId>
+              <artifactId>wagon-ssh</artifactId>
+              <version>3.3.4</version>
+            </dependency>
+          </dependencies>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-surefire-report-plugin</artifactId>
+          <version>3.0.0-M3</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-jxr-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-project-info-reports-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
       </plugins>
     </pluginManagement>
   </build>