mdns-alias v1.3

Changes

• Reduce log verbosity: routine lifecycle events (publish, disconnect,
  hostname change) are logged at INFO, per-retry messages at DEBUG.
  The default NOTICE level is silent during normal operation

Bug Fixes

• Fix crash on SIGHUP while disconnected from Avahi, e.g. when the
  hostname change that triggered the reload also restarted avahi-daemon.
  The new hostname is now recorded and CNAMEs are republished when the
  connection is back
• No longer exit on entry group failures, CNAME collisions, or publish
  errors, all are treated as transient and retried with a full reconnect
  every 3s
• Retry connecting at startup if D-Bus is not yet available,
  AVAHI_CLIENT_NO_FAIL only covers a missing avahi-daemon