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/endpoint-ellipses_test.go

@@ -44,7 +44,6 @@ func TestCreateServerEndpoints(t *testing.T) {
 		{":9000", []string{"/export1{1...32}", "/export1{1...32}"}, false},
 		// Same host cannot export same disk on two ports - special case localhost.
 		{":9001", []string{"http://localhost:900{1...2}/export{1...64}"}, false},
-
 		// Valid inputs.
 		{":9000", []string{"/export1"}, true},
 		{":9000", []string{"/export1", "/export2", "/export3", "/export4"}, true},