Sentinel.execute_command doesn't execute across the entire sentinel cluster #2458
Description
Version: 4.3.4
Platform: Python 3.8.10 on Ubuntu 20.04
Description: When the once argument isn't given or is set to false, the Sentinel.execute_command doesn't execute across the sentinel cluster like the documentation suggests.
For example,
when I connect to a sentinel cluster with two sentinels, and run the execute_command, only one of the sentinels receive the command.
Sentinel 1 logs (doesn't receive RESET command)
Sentinel 2 logs (receives RESET command)
It also seems like if the once argument is set to True, then instead of executing the command on just 1 random sentinel, the command is executed across the cluster.
