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Let's save log.Error for things the user can take action on.
Moved all our diagnostics to log.Debug. We can ideally reduce them
even further.

This addr manager should seriously help with the addrsplosion
problem.

This commit makes all network tests use ZeroLocalTCPAddress
as the initial peer address, and then relies on
net.ListenAddresses()

This should get rid of the tcp addr clash problems.

The net package is the next to move. It will be massaged
a bit still to fix the Network / "NetworkBackend" conflict.