[MNGSITE-540] Use correct plugin for reporting

With https://issues.apache.org/jira/browse/MPLUGIN-423 the reporting
mojo has been extracted in a dedicated plugin
Encapsulate in "reporting" profile

Author: kwin

maven-scm-plugin/pom.xml

@@ -224,13 +224,18 @@
     </plugins>
   </build>
 
-  <reporting>
-    <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-plugin-plugin</artifactId>
-      </plugin>
-    </plugins>
-  </reporting>
+  <profiles>
+    <profile>
+      <id>reporting</id>
+      <reporting>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-plugin-report-plugin</artifactId>
+          </plugin>
+        </plugins>
+      </reporting>
+    </profile>
+  </profiles>
 
 </project>