When using '--force-new --smt-ip ...' options,
validate that the instance can use the --smt-ip value
in order to save debugging or unnecessary errors

- Leverage has_ipv6_access
- Refactor has_ipv6_access
  to accomodate IPv4 check

- Less knowledge littering
- Check request exception for
  - established connection
  - timeout
- Handle general request exception

- The message is checked if connection failed,
  use that and remove the if to set the message

- Rename method to reflect the correct intend
- Check if a request could be made, handle behaviour
  accordingly

- Check socket connection
- Restore has_ipv6_access as it was
- Remove __connection_check

- Close socket connection
- Return False for any socket error

- When checking if instance can access IPv6 infra server,
  make sure the instance can handle IPv6 addresses