~ltrager/maas/lp1603563

Viewing all changes in revision 5506.

[r=ltrager][bug=1633822][author=mpontillo] Store reverse-DNS lookups in the database whenever neighbours are updated.

 * Add trigger boilerplate so we can register with the listener for
   changes to the neighbour table.
 * Add ReverseDNSService to listen for neighbour changes.
 * Add utilities to reverse-resolve IP addresses, and sort the results.

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