Add timeout on check wan address on motd

[SuperKali]

Description

Add a timeout on check the wan address

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• I self performed a test on my environment.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings

[viraniac]

Personally I don't understand why there is a need to get public IP for a system and show it in motd. But assuming its needed by others, why not just use --connect-timeout option of curl and specify a timeout directly. That way there will be no need to ping anything first and hence there will be no need to hard code Google's dns server either