eliminate periodic 'tick' in connection_maker
checkStateAndAttemptConnections already performs a full scan of all
potential targets, from which we can easily determine the nearest
future time (or, rather, its duration from now) on which an attempt is
due.

We also need to kick the ConnectionMaker into action when we receive a
topology update containing new connections.
Merge pull request #78 from zettio/77_eliminate_connection_maker_tick

eliminate periodic 'tick' in connection_maker