piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ 54cdac97f150f670e60f7ce0590e3bbf428d394a

Roger Dingledine 54cdac97f1 print right controller purpose string for measure-timeout circs		15 lat temu
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1693-withhold-hsdir-if-no-dirport	c6f5792404 No dirport should mean no hsdir flag (bug 1693)	15 lat temu
string-for-measure-timeout-circs	54cdac97f1 print right controller purpose string for measure-timeout circs	15 lat temu