MUC: Fixed: Variable referencing the host session wasn't initialized.

prosodyctl, util.prosodyctl: Show error when mod_posix is not enabled and an attempt is made to query Prosody's status (thanks stever)

util.pubsub: Add :get_subscription() to return the current subscription for a JID, if any

util.filters: Support for 'filter hooks' that get called when a session is initialized for filters

Merge backout

Backed out changeset bfc47564aaef (No need for _M with module.environment)

mod_pubsub: Use module.environment to reference the module's environment

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