DNS enhancements

[mcp 0]

Could you add the following enhancements:

 

1. Lock the dns. If the DNS is changed locally (e.g. hijacked) it should always force itself back to AirVPN's.

 

2. Could you add DNS server verification (like DNSCrypt)?

 

3. Could there be a set interval for verification e.g. every second, otherwise network lock activates?