Always run OSGi HTTP service on random port in itests (#11523)

It is probably always a good idea to run the OSGi HTTP service on a random available port in itests.
So when this is always done it prevents future issues and removes a bit of duplication.

Signed-off-by: Wouter Born <github@maindrain.net>

itests/pom.xml

@@ -38,6 +38,7 @@
 
   <properties>
     <m2e.jdt.annotationpath>target/dependency</m2e.jdt.annotationpath>
+    <org.osgi.service.http.port>9090</org.osgi.service.http.port>
   </properties>
 
   <dependencies>
@@ -179,6 +180,24 @@
               </bndruns>
             </configuration>
           </plugin>
+          <plugin>
+            <groupId>org.codehaus.mojo</groupId>
+            <artifactId>build-helper-maven-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>reserve-network-port</id>
+                <goals>
+                  <goal>reserve-network-port</goal>
+                </goals>
+                <phase>process-resources</phase>
+                <configuration>
+                  <portNames>
+                    <portName>org.osgi.service.http.port</portName>
+                  </portNames>
+                </configuration>
+              </execution>
+            </executions>
+          </plugin>
         </plugins>
       </build>