Upgrade nuxeo-samples child projects to 5.5 (nuxeo-sample-client and sample-remote-java)

The pom from addons/nuxeo-samples has been upgraded to 5.5 to be able to add nuxeo-sample-webservice as a child project based on 5.5. For now, the other child projects nuxeo-sample-client and sample-remote-java have been commented from the modules section of the nuxeo-samples parent pom, waiting for these projects to be upgraded to 5.5.