Changes on logging when calling dappnode_connect:

1. The same error.message will only be printed once. The error message is tracked, and if it's repeated the script will just print a . (dot) without new line.
2. When the DAPPMANAGER is polled for the domain and external IP; if the DAPPMANAGER is still initializing it will return an empty hostname. Catch that specific error named as NO_HOSTNAME_RETURNED_ERROR and just print Initializing DAppNode... instead of the previous error message:

retry #2 - VPN not ready, status: FETCHING_CONFIG_ERROR #2 - No hostname returned