net.adns: Utilise new net.dns API to handle DNS network errors

net.dns: Multiple internal changes and API extensions to allow for more reliable DNS lookups

net.server: Add checking for nil sockets to prevent traceback

ejabberd2prosody: Fixed a problem with null roster groups.

ejabberd2prosody: Fixed escape code processing when parsing strings.

ejabberd2prosody: Added support for ask='both' in subscriptions.

MUC: Removed some debug logging.

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