net.dns: Add dns.settimeout() to set the timeout for the default resolver

net.dns: Make timeout configurable (default 15s)

net.dns, net.adns: Update resolver:cancel() API so that a table doesn't need to be created for each cancellation internal to net.dns

net.dns, net.adns: Move coroutine-calling logic into resolver:cancel()

net.dns: Handle our own timeouts, including falling onto other servers in resolv.conf if necessary

mod_roster: Use value returned by pairs() during roster iteration to avoid dozens of wasteful table lookups

mod_bosh: Add jabber:client namespace to stanzas with no namespace

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

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