When managing the etcd clusters we want to know also if the cluster is healthy or not, specially before and after taking
some actions.
This is to introduce a method to retrieve the cluster health status, the equivalent of:
member 5208bbf5c00e7cdf is healthy: got healthy result from https://toolsbeta-test-k8s-etcd-6.toolsbeta.eqiad1.wikimedia.cloud:2379 member 5ffb924838da87fe is healthy: got healthy result from https://toolsbeta-test-k8s-etcd-4.toolsbeta.eqiad1.wikimedia.cloud:2379 member 8a72276c69aa404b is healthy: got healthy result from https://toolsbeta-test-k8s-etcd-8.toolsbeta.eqiad1.wikimedia.cloud:2379 member c180a79686e4a7de is unhealthy: got unhealthy result from https://toolsbeta-test-k8s-etcd-5.toolsbeta.eqiad1.wikimedia.cloud:2379 member cf058388c7baaeeb is healthy: got healthy result from https://toolsbeta-test-k8s-etcd-7.toolsbeta.eqiad1.wikimedia.cloud:2379 member f91f3e741e62d53e is healthy: got healthy result from https://toolsbeta-test-k8s-etcd-9.toolsbeta.eqiad1.wikimedia.cloud:2379 cluster is healthy