Fix memory leak when reloading expected network list.
Fix memory leak when reloading expected network list.

Before, when reloading the configuration, expected IP ranges for
per-user ports would just be added to the end of the list, which could
therefore grow without limit. Now the list is cleared during reload, so
they replace the old list instead.

andybalholm/redwood,unixabg/redwood,unixabg/redwood,andybalholm/redwood