LOAD ... TO RUNTIME should happen only after changes were made

[krzysztof-ksiazek]

• ProxySQL Tools version: 3.10
• Python version: n/a
• Operating System: n/a

Description

As of now proxysql-tools executes reload_runtime() quite often when registering backends. This is not without an impact on ProxySQL and performance in general. All changes should be made in "MEMORY" and loaded to runtime only once per 'proxysql-tool galera register' execution. Additionally, if no changes happened (so mysql_servers after changes are the same as runtime_mysql_servers in ProxySQL), there's no need to load them up.