Reduce logging noise of Fabric8FlinkKubeClient

The Fabric8FlinkKubeClient logs a lot of information on log level INFO. I think some of the information is quite specific and is not needed by most users. In order to reduce the log noise for our users, I would suggest to only log the K8s resource specs on log level DEBUG. Also the handling of Watcher events does not need to be logged on INFO level. One could for example log that one creates a service with a given name on INFO and only include the specs if the log level is DEBUG.