Don't print debug servers list unless we do tacacs lookup

Unlike most of the other tacacs client code, we run as part of many
processes, and because of min_uid, and mapped user lookups, often
don't actually make a tacacs connection.

So don't log the debug message showing the servers, unless we are
actually going to do the tacacs lookup.  This significantly reduces
noise messages in syslog from local user lookups.

Only print 'uid N < min_uid' if debug > 1, since it can occur so
frequently, and isn't as useful as some other debug messages.

Also some minor cleanup while looking for possible incorrect closes.

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