Add Kafka properties in nuxeo-conf for ftests

When the kafka profile is active, add the following properties in the nuxeo-conf Ant target:

• kafka.enabled=true
• kafka.zkServers=${kafka.zkServers}
• kafka.bootstrap.servers=${kafka.bootstrap.servers}
• nuxeo.stream.work.enabled=true

In the manner of mongodb and marklogic profiles.

This is not the state of the art, because tools-nuxeo-ftest should stay as much generic as possible, but this solution is needed for now to satisfy NXP-24009.