Remove wait time for leak preventor

This is no longer necessary due to the new SimpleClassLoaderLifeCycle,
that is configured in the jetty startup for integration tests in the
poms of scm-webapp and scm-it.

Jenkinsfile

@@ -37,7 +37,7 @@ node('docker') {
       }
 
       stage('Integration Test') {
-        mvn 'verify -Pit -pl :scm-webapp,:scm-it -Dmaven.test.failure.ignore=true -DClassLoaderLeakPreventor.threadWaitMs=10'
+        mvn 'verify -Pit -pl :scm-webapp,:scm-it -Dmaven.test.failure.ignore=true'
       }
 
       stage('SonarQube') {