remove_dns_by_value
Description:
Removes the DNS server at index i.
Parameters:
| this | the SettingIP6Config | 
| dns | the IPv6 address of the DNS server to remove | 
Returns:
| 
 | 
Removes the DNS server at index i.
| this | the SettingIP6Config | 
| dns | the IPv6 address of the DNS server to remove | 
| 
 |