mod_cloud_notify: Cleanup code and drop support for prosody 0.9 This removes some legacy stuff that was needed for prosody 0.9 We now use util.stanza:find instead of our own patched version to be more mainstream The unneeded module unloading code was removed, too

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summary: Allow server administrators to probe any user
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This module lets server administrators send `<presence type="probe"/>`
to any local user and receive their presence in response, bypassing
roster checks.