Added clnt_create_with_retry

To attempt to work around EADDRINUSE error that Kevin experiences when
disconnecting from RDP while hammernfs is running.

Also made some tweaks to kill warnings when building with -Wall.
Config and test changes.

Host list tab of configuration gets a minor make over to make the
new feature allowed host names more clear.

git commit id: execute the git command in the *load-pathname* directory.

performance.sh with no args doesn't create log file.