PLT-2899 adding clustering of app servers (#3682)

* PLT-2899 adding clustering of app servers

* PLT-2899 base framework

* PLT-2899 HA backend

* PLT-2899 Fixing config file

* PLT-2899 adding config syncing

* PLT-2899 set System console to readonly when clustering enabled.

* PLT-2899 Fixing publish API

* PLT-2899 fixing strings

store/sql_user_store.go

@@ -502,7 +502,7 @@ func (s SqlUserStore) GetEtagForDirectProfiles(userId string) StoreChannel {
 			result.Data = fmt.Sprintf("%v.%v.0.%v.%v", model.CurrentVersion, model.GetMillis(), utils.Cfg.PrivacySettings.ShowFullName, utils.Cfg.PrivacySettings.ShowEmailAddress)
 		} else {
 			allIds := strings.Join(ids, "")
-			result.Data = fmt.Sprintf("%v.%v.%v.%v.%v", model.CurrentVersion, md5.Sum([]byte(allIds)), len(ids), utils.Cfg.PrivacySettings.ShowFullName, utils.Cfg.PrivacySettings.ShowEmailAddress)
+			result.Data = fmt.Sprintf("%v.%x.%v.%v.%v", model.CurrentVersion, md5.Sum([]byte(allIds)), len(ids), utils.Cfg.PrivacySettings.ShowFullName, utils.Cfg.PrivacySettings.ShowEmailAddress)
 		}
 
 		storeChannel <- result