redis-benchmark: improved help and warnings (#9419)

1. The output of --help:

  * On the Usage line, just write [OPTIONS] [COMMAND ARGS...] instead listing
    only a few arbitrary options and no command.
  * For --cluster, describe that if the command is supplied on the command line,
    the key must contain "{tag}". Otherwise, the command will not be sent to the
    right cluster node.
  * For -r, add a note that if -r is omitted, all commands in a benchmark will
    use the same key. Also align the description.
  * For -t, describe that -t is ignored if a command is supplied on the command
    line.

2. Print a warning if -t is present when a specific command is supplied.

3. Print all warnings and errors to stderr.

4. Remove -e from calls in redis-benchmark test suite.

0 files changed, 0 insertions, 0 deletions