[PATCH] register_hook_before to complement register_hook

[Jacob Burkhart]

Hi,

I have a need in my plugin for an additional method on VHost.pm called
register_hook_before

This is because I want my offline storage plugin to be registered last in
the chain for message delivery, but First in the chain for OnInitialPresence

Please consider this patch for inclusion.

thanks,
Jacob

register_hook_before_patch.diff
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