hope to collect clients log files by support command

[aspirer]

when use curveadm support command, we only collect server service logs now, we may need collect clients logs by given host and mountpoint.

[Wine93]

On the other hand, we need a limit option for handle large logs situation.

[aspirer]

the client log file path can be specified by user, such as: curveadm support --with-client-logs /path/to/logs/dir the logs dir must be local path on current host. if the client is running on remote host, the user should collect all/failed clients logs manually to curveadm host.