xmppclient_listener: Use : syntax for connection methods, to be compatible with new server.lua

xmppclient_listener: Switch to .onincoming listener method, to be compatible with new server_event.lua

net.server: Small fix for addtimer() compatibility code

net.connlisteners: Standardise on new syntax for addserver(), and clean up a bit

sessionmanager: Use : syntax for calling connection methods

mod_bosh: Don't log response XML

util.timer: Fix libevent timers (event.base doesn't exist...)

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