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Handle the failure to send notify more gracefully and with log

Ondřej Surý requested to merge 4001-4002-retry-over-TCP-when-notify-sending-fails into main

When dns_request_create() failed in notify_send_toaddr(), sending the notify would silently fail. When notify_done() failed, the error would be logged on the DEBUG(2) level.

This commit remedies the situation by:

  • Promoting several messages related to notifies to INFO level and add a "success" log message at the INFO level

  • Adding a TCP fallback - when sending the notify over UDP fails, named will retry sending notify over TCP and log the information on the NOTICE level

  • When sending the notify over TCP fails, it will be logged on the WARNING level

Closes: #4001 (closed), #4002 (closed)

Closes #4001 (closed)

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