piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ 311aca5a3472cd318b72ca21d7a530182154e75c

Roger Dingledine 8aec982f91 Merge branch 'maint-0.2.1'		16 lat temu
..
1324-fetch-from-v3-not-v2	0324d3b0ec fetch relay descriptors from v3 authorities	16 lat temu
dont_segfault_client_on_hup	80d9737e70 Fix a segfault when a client is hup'd.	16 lat temu