fix: sentinel should not reconcile until replication cluster ready

[drivebyer]

Description

Fixes #522

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• Tests have been added/modified and all tests pass.
• Functionality/bugs have been confirmed to be unchanged or fixed.
• I have performed a self-review of my own code.
• Documentation has been updated or added where necessary.

Additional Context

[codecov]

Codecov Report

Attention: Patch coverage is 11.11111% with 16 lines in your changes missing coverage. Please review.

Project coverage is 40.98%. Comparing base (d121d86) to head (412e698).
Report is 63 commits behind head on master.

Files	Patch %	Lines
k8sutils/redis-sentinel.go	0.00%	12 Missing ⚠️
k8sutils/redis-replication.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #964      +/-   ##
==========================================
+ Coverage   35.20%   40.98%   +5.78%     
==========================================
  Files          19       20       +1     
  Lines        3213     2674     -539     
==========================================
- Hits         1131     1096      -35     
+ Misses       2015     1505     -510     
- Partials       67       73       +6     

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