kpm diagnostic tool includes wrong log files in case of remote KB server

The kpm diagnostic tool includes the log files from the path `/var/lib/tomcat` or the path specified via the `--log-dir` directory from the local machine on which the kpm diagnostic tool is run.  If KB is running on a different server (specified via the `--killbill-url`) the log files from this remote server (and not the local log files) should be included. 