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.
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