add script to monitor redis application through the check_mk agent

[earendilfr]

It's the same script than snmp/redis.py but I just add the output of the line for application name:

output = {
    "version": version,
    "error": error,
    "errorString": error_string,
    "data": redis_data,
}
print("<<<redis>>>")
print(json.dumps(output))

[CLAassistant]

All committers have signed the CLA.

[bestlong]

LGTM