feat: add Redis Sentinel metrics ckquorum

[opan]

Expose new metrics for Redis Sentinel from command SENTINEL CKQUORUM <master-name>

[coveralls]

Pull Request Test Coverage Report for Build 1660

• 10 of 10 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 92.151%

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Totals
Change from base Build 1648:	0.04%
Covered Lines:	1808
Relevant Lines:	1962

---

💛 - Coveralls

[codecov]

Codecov Report

Merging #691 (9391f0f) into master (78f0431) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #691      +/-   ##
==========================================
+ Coverage   88.18%   88.24%   +0.06%     
==========================================
  Files          16       16              
  Lines        1946     1956      +10     
==========================================
+ Hits         1716     1726      +10     
  Misses        154      154              
  Partials       76       76              

Impacted Files	Coverage Δ
exporter/exporter.go	91.58% <100.00%> (+0.01%)	⬆️
exporter/sentinels.go	89.16% <100.00%> (+0.87%)	⬆️

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[oliver006]

Thanks for the PR! I'll try to get to reviewing it in the next few days.

[opan]

@oliver006 Thanks!

[opan]

@oliver006 I just push a new commit contains fix for the log debug for masterCkquorum metric

[oliver006]

Looks good. One last nit and then this should be good to go.

[oliver006]

Released as https://github.com/oliver006/redis_exporter/releases/tag/v1.44.0