In test tcl files, a lot of "redis" keywords represent server，for example

spawn_instance redis $::redis_base_port $::instances_count {
        "enable-protected-configs yes"
        "enable-debug-command yes"
        "save ''"
}

We would like to use other words to replace the "redis"

Note:
1.Do not touch the words such as "redis_version" because in the info command, we will still keep these output
2. Do not change any RedisModule* words becuase we still want to keep it.