new ConnectedServerType in config | little improve

[mrpalide]

Did you run make format && make check? Yes

Fixes #_

Changes:

• add alternative value to GetIP for check public IP of visor. (https://ip.plaintext.ir)
• add new field to config file servers_type that determine what type of dmsg servers visor should connect. all, official and community are available values. Default value is all.

How to test this PR:

• build
• generate config, change servers_type value under dmsg config part to community
• run visor, check connected dmsg server (available in logs)
• stop visor, change servers_type to official, run again and check logs.
• stop visor, change servers_type to all or empty or any other things (have same behavior), run again and check logs.