connectionFSM could log when it's trying to connect, abandoning, and delaying

[davepacheco]

It would be helpful if the ConnectionFSM class logged (even if TRACE or DEBUG level) when it attempts to make a connection, gives up on one, starts delaying, and then starts retrying. (I wanted this in order to verify the fix for MORAY-384, and I ended up using snoop to watch this instead. But in production that's not necessarily tenable, and it may well be useful to observe whether cueball is trying to establish connections.)