mod_saslauth: Handle session bind requests to the host, fixes OneTeam login

s2smanager: Destroy session on immediate failure of a connection attempt (e.g. inability to create sockets)

s2smanager: Handle DNS lookup error in response handler

s2smanager: send_to_host(): Handle already-destroyed session and bounce stanza accordingly

s2smanager: new_outgoing(): Destroy session if first connection attempt fails immediately (e.g. can't create sockets)

net.adns: Handle dns.query() failures, and pass error to handler

net.dns: resolver:query(): Handle getsocket() failures, and return true on success

(0) -3000 -1000 -300 -100 -30 -10 -7 +7 +10 +30 tip

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