mod_iq: Don't treat an iq as handled if session.send() returns false

mod_message: Don't treat a message as delivered ok if session.send() returns false

mod_c2s: Don't call ondisconnect manually on close, it is now called by net.server. Replace with inline code for destroying the session, and also waiting for a reply </stream:stream> if there is a chance of further data sent by the client. session.send() on a half-closed stream returns false (and does not deliver the data).

net.http: Don't call ondisconnect manually, net.server now calls it on close

net.server_select, net.server_event: Change semantics of conn:close() - always call ondisconnect (with err == nil), and never close with data in send buffer (i.e. 'now' parameter removed)

sessionmanager: Have session.send() of a retired session return false to indicate failure

mod_s2s: Make unauthed session timeout a little more aggressive... otherwise it's possible for sessions to slip under the net and never get killed off

mod_s2s/s2sout.lib: Fix indentation

Merge 0.9->trunk

mod_s2s/s2sout.lib: Don't wait for both v4 and v6 DNS responses if we only send one (e.g. because v6 is disabled)