sessionmanager: Return stream error when incoming stream header is missing 'to' attribute

sessionmanager: Add close method to resting sessions

s2smanager: Don't re-destroy destroyed sessions

s2smanager: Add open_stream and close methods to resting sessions

sessionmanager, s2smanager: Close session on </stream:stream>

sessionmanager, s2smanager: Destroyed sessions are now simply resting (not dead) until they are collected - prevents a whole class of tracebacks

net.xmppserver_listener: Clarify log message (for nil/false)

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mercurial