- added unload_replay to free replay0 and ospf0 and all dynamically
allocated objects connected connected to them
- added 'started' member to ospf struct indicating that
loading/unloading is not occuring (i.e. ospf is listening/sending)
- added set_router_lsa to main before start_listening
- added set_router_lsa if ospf0->started to add/remove prefix/neighbor