vastly reduce unnecessary database writes #43

1. 
   dooglus commented at 10:54 pm on January 24, 2011: contributor

   The code updates database for every seed node every time we make a new outgoing connection. This isn’t necessary.
2. Repeatedly resetting the timestamp for seed nodes in the database was slow. Only update the database if it's a real change. 10abe4f26e
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dooglus