Health checks don't work

[evie-lau]

It seems some of these checks don't properly reflect the state of the services.

        if ( mapRepository != null && mapRepository.connectionReady()
         && playerClient != null && playerClient.isHealthy()
         && kafka != null && kafka.isHealthy() )

• mapRepository.connectionReady() always returns true
• kafka.isHealthy() still returns true after bringing down kafka

[ebullient]

Kafka is optional, so that health behavior is expected.

For health: it will return false if injection of mapRepository failed (though I think CDI might fail
We can check the ektorp library to see what other active checking we might be able to do