Fix path of redis-check-script in check-command for accessing redis-check script.

[marvish4ppi]

There is an issue with calling the redis-check-script caused by the a wrong path.
The redis check script is only named "check_redis" and not "check_redis.pl"

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[marvish4ppi]

Comment for verifying CLA Agreement

[bobapple]

@cla-bot check

[marvish4ppi]

Is something missing here for the pull-request to get approved?

[Al2Klimov]

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