xmppcomponent_listener: Import jid_split to fix undefined global reference

mod_component: Read validate_from_addresses option from the config

Merge 0.7->trunk

mod_privacy: Add service discovery feature.

xmppcomponent_listener: Don't validate to/from on non-stanzas, fixes component auth.

xmppcomponent_listener: Validate to/from on components, fixes #104 and #162

Merge 0.7->trunk

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