Make redis-cli --help/-h output to stdout and exit with 0. (#9124)
Make redis-cli --help/-h output to stdout and exit with 0. (#9124)

If user executes redis-cli --help, the content should be output to stdout and exits with 0.
JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis