Add etcd part of config support, add noColor/json support (#8439)

- Add color/json mode support for get/help commands
- Support ENV help for all sub-systems
- Add support for etcd as part of config

cmd/bucket-handlers.go

@@ -106,7 +106,7 @@ func initFederatorBackend(objLayer ObjectLayer) {
 			}
 
 			// This is not for our server, so we can continue
-			hostPort := net.JoinHostPort(dnsBuckets[index].Host, fmt.Sprintf("%d", dnsBuckets[index].Port))
+			hostPort := net.JoinHostPort(dnsBuckets[index].Host, dnsBuckets[index].Port)
 			if globalDomainIPs.Intersection(set.CreateStringSet(hostPort)).IsEmpty() {
 				return nil
 			}