When we want to copy JARS and deploy it on JDG server in standalone/clustered.xml is no deployment-scanner element defined. It should be added when server is built

Steps to Reproduce:
1. cp filter-converter.jar infinispan-server-7.0.0.CR2/standalone/deployments/
2. look at console output of server
3. check if there is no output from deployment scanner

Current results: not output from deployment scanner, because it is not enabled

Expected results: we should see following output in console log
JBAS015012: Started FileSystemDeploymentService for directory /home/infinispan-server-7.0.0.CR2/standalone/deployments
JBAS015876: Starting deployment of "filter-converter.jar" (runtime-name: "filter-converter.jar")