Allow server to start if one of local nodes in docker/kubernetes setup is resolved (#7452)

Allow server to start if one of the local nodes in docker/kubernetes setup is successfully resolved

- The rule is that we need atleast one local node to work. We dont need to resolve the
  rest at that point.

- In a non-orchestrational setup, we fail if we do not have atleast one local node up
  and running.

- In an orchestrational setup (docker-swarm and kubernetes), We retry with a sleep of 5
  seconds until any one local node shows up.

Fixes #6995

cmd/storage-rest_test.go

@@ -508,6 +508,10 @@ func newStorageRESTHTTPServerClient(t *testing.T) (*httptest.Server, *storageRES
 		t.Fatalf("NewEndpoint failed %v", endpoint)
 	}
 
+	if err := endpoint.UpdateIsLocal(); err != nil {
+		t.Fatalf("UpdateIsLocal failed %v", err)
+	}
+
 	registerStorageRESTHandlers(router, EndpointList{endpoint})
 	restClient, err := newStorageRESTClient(endpoint)
 	if err != nil {