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/globals.go

@@ -184,7 +184,8 @@ var (
 	// Time when object layer was initialized on start up.
 	globalBootTime time.Time
 
-	globalActiveCred  auth.Credentials
+	globalActiveCred auth.Credentials
+
 	globalPublicCerts []*x509.Certificate
 
 	globalDomainNames []string      // Root domains for virtual host style requests