Fix generation of surefire report during site generation

Change-Id: I29b1bcfe6cb1714e3dd0e8f5aa47c7f34f1d2fc9
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

pom.xml

@@ -620,7 +620,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-report-plugin</artifactId>
-        <version>${maven-surefire-version}</version>
+        <version>${maven-surefire-report-plugin-version}</version>
         <configuration>
           <aggregate>true</aggregate>
           <alwaysGenerateSurefireReport>false</alwaysGenerateSurefireReport>