Cherry-pick #23438 to 7.x: Upgrade redis client

[ChrsMark]

Cherry-pick of PR #23438 to 7.x branch. Original message:

What does this PR do?

This PR updates redis client library used by Metribceat module , redis output and redis filebeat input.

Why is it important?

So as to support URLs and TLS settings.

How to test this PR locally

Test Metricbeat Redis module

1. run a redis target service running docker-compose up inside module/redis directory
2. enable redis module and set the proper host ie 0.0.0.0:32837 (run docker ps to find the exposed port in your case)
3. Exec inside redis container and run redis-cli to populate keys: SET mykey "Hello"
4. Start metricbeat and verify that metrics are being collected

Test Filebeat Redis slowlog fileset

1. Enable redis slowlog with the proper host and start Filebeat.
2. Execute again inside the redis container and create some keys. Then feed slowlog with CONFIG SET slowlog-log-slower-than 5 and keys *.
3. Verify that metrics are being collected.

Test redis output

1. Define redis output for metribceat ie (set the proper host):

output.redis:
  hosts: ["0.0.0.0:32837"]
  key: "metricbeat"
  db: 0
  timeout: 5

2. Metricbeat module to collect some metrics
3. Using redis-cli verify that metrics are sent to Redis with lrange metricbeat 0 1

Test Filebeat redis input

1. Enable redis input

filebeat.inputs:
- type: redis
  hosts: ["0.0.0.0:32837"]

2. Start Filebeat
3. Execute again inside the redis container and create some keys. Then feed slowlog with CONFIG SET slowlog-log-slower-than 5 and keys *.
4. Verify that metrics are being collected.

Related issues

#16522
elastic/integrations#361

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Pinging @elastic/integrations (Team:Integrations)

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Build stats

• Build Cause: Pull request #23497 opened

• • Start Time: 2021-01-14T08:45:22.021+0000

• Duration: 99 min 24 sec

• Commit: c57dbd6

Test stats 🧪

Test	Results
Failed	0
Passed	16790
Skipped	1248
Total	18038

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Test stats 🧪

Test	Results
Failed	0
Passed	16790
Skipped	1248
Total	18038