Bring back variable netmask code from revision 1.180, with some minor
changes; Print a warning when the DB slots are null, and return standard 255.255.255.0. This is for the transition phase. Also add version 12 modification to routerconfig; return the "src" from the virt_routes table, so that the client side can figure out what interface the route is associated with. There are associated changes in libsetup to ifconfig,routerconfig,tunnelconfig.
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