mod_pubsub, mod_pep: Support per-node configurable inclusion of publisher

This matches ejabberd's behaviour, using the 'pubsub#itemreply' config option.

Although the current definition of this option in the specification is not
as clear as it could be, I think matching what existing deployments do is the
best option to resolve the ambiguity and reduce fragmentation.

We should update the spec to be clearer about how to use and interpret this
option.

The 'expose_publisher' option for mod_pubsub is now an override (always expose
or never expose). If unset, it will use the per-node config (which defaults to
not exposing).

Thanks to Link Mauve, edhelas and goffi for sparking this feature.

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