[Enhancement] verify-config.js script - check if the dashboard port is open

[HiiZun]

Is your feature request related to a problem? Please describe.
If the port 3000 for example is used by another nodejs process the script will not warn that.

Describe the solution you'd like
Make the script checking if the port in the config is open or used

Describe alternatives you've considered
Check if the dashboard is enabled, if yes check if the port is open by using a module (i don't see another alternative) like net

• example: https://gist.github.com/timoxley/1689041

Additional context
None

[Androz2091]

Added in v4.7.1