mod_smacks: Add more logging

mod_smacks: Remove useless delay in requesting ack on resumption Was this the last place using the delay? Nice!

mod_smacks: Fix to not wait for acks from before a resumption Otherwise it can get stuck waiting indefinitely for an ack that made it notice the connection was stale.

mod_smacks: Split log messages for when an old session exists in storage Non-existent did not seem entirely accurate for this case

mod_smacks: Bounce unacked stanzas on shutdown

mod_smacks: Preserve counter values on shutdown

mod_smacks: Simplify access to local user sessions Less to type if per chance the next commit also wants to access sessions.

mod_smacks: Cancel hibernation when session is closed To ensure that if a session is replaced after it has gone into hibernation, it does not come back and cause trouble for the new session (see previous commit).

mod_smacks: Skip hibernation logic if session was closed or replaced The resumption_token is removed when the session is closed via the pre-session-close event, signaling that it cannot be resumed, and therefore no hibernation timeout logic should be invoked. Fixes that if a session somehow is replaced by a new one using the same resource (which is the common behavior), the old session would still be around until it times out at which point it sends `<presence type="unavailable"/>` which would look as if it came from the new session, ie appearing offline to everyone including MUCs.

mod_smacks: Fix indentation Meld keeps messing up indentation when I merge and rebase...