When testing and debugging the cluster code before, you need
to stop the cluster after making changes, and then start the
cluster again. Add a restart option for ease of use.
In #9788, now we stores all persistent append-only files in
a dedicated directory. The name of the directory is determined
by the appenddirname configuration parameter in redis.conf.
Now each node have a separate folder.
Update create-cluster clean to clean this default directory.
Allows for setting the binaries path if used outside the upstream repo.
Also documents `call` in usage clause (TODO: port to
`redis-cli --cluster call` or just deprecate it).