Refactor choose_good_entry_server so it is (almost) never used
From my prop271 branch:
* XXXX prop271 this function is used in four ways: picking out guards for * the old (pre-prop271) guard algorithm; picking out guards for circuits; * picking out guards for testing circuits on non-bridgees; * picking out entries when entry guards are disabled. These options * should be disentangled.
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