propagate current redis cluster state to redisfailver crd

[romanfurst]

Current implementation

If Redisfailover cluster is not in healthy/ready state the state is not propagated. Therefore there is no way how to propagate the redis status to the user.

Showcase from ArgoCD where rfr POD is not running but redisfailover crd is in healthy state. Broken redisfailover cluster is not propagated:

Propose implementation

Add 'status' section in RedisFailover CRD. If Redisfailover cluster in not in OK state, the redisfailover crd status is updated. Therefore it is possible to make healthcheck above whole Redisfailover cluster.
E.g. in ArgoCD the custome health check might look like this:

    databases.spotahome.com/RedisFailover:
      health.lua: |
        hs = {}
        if obj.status ~= nil and obj.status.state == "NotHealthy" then
          hs.status = "Degraded"
          hs.message = obj.status.message
          return hs
        end
        hs.status = "Healthy"
        hs.message = ""Redisfailover cluster is healthy""
        return hs

as shown in following printscreen, if redisfailover is broken whole crd resource and application is mark as unhealthy