IPv6 v3 Onion Services support

Using the latest tor master (3092c8bb3e) and the latest chutney (d3cec81):

chutney/tools/test-network.sh --flavour single-onion-v3-ipv6

Fails and logs a bug message:

Sep 13 12:21:43.845 [notice] Tor has successfully opened a circuit. Looks like client functionality is working.
Sep 13 12:21:43.845 [notice] Bootstrapped 100%: Done
Sep 13 12:21:44.798 [info] set_rotation_time: Next descriptor rotation time set to 2017-09-13 12:24:00 for ya3etbnz4ncqaexjurfbtozzp5puva3uzw2apbaatfvvpsvyzq7iikid
Sep 13 12:21:44.802 [info] build_descriptors_for_new_service: Hidden service ya3etbnz4ncqaexjurfbtozzp5puva3uzw2apbaatfvvpsvyzq7iikid has just started. Both descriptors built. Now scheduled for upload.
Sep 13 12:21:44.803 [info] extend_info_from_node: Including Ed25519 ID for $DB859DF7648323E1766C122E077DA476720A0FB0~test000a at 127.0.0.1
Sep 13 12:21:44.803 [warn] tor_bug_occurred_: Bug: src/or/hs_service.c:403: service_intro_point_new: Non-fatal assertion !(!ls) failed. (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.805 [warn] Bug: Non-fatal assertion !(!ls) failed in service_intro_point_new at src/or/hs_service.c:403. Stack trace: (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.805 [warn] Bug:     0   tor                                 0x000000010d938989 log_backtrace + 73 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.805 [warn] Bug:     1   tor                                 0x000000010d9a6614 tor_bug_occurred_ + 452 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.805 [warn] Bug:     2   tor                                 0x000000010d74b671 hs_service_run_scheduled_events + 12817 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.805 [warn] Bug:     3   tor                                 0x000000010d7754fe hs_service_callback + 62 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.806 [warn] Bug:     4   tor                                 0x000000010d7f024f periodic_event_dispatch + 271 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.806 [warn] Bug:     5   libevent-2.1.6.dylib                0x000000010e4a90bf event_process_active_single_queue + 371 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.806 [warn] Bug:     6   libevent-2.1.6.dylib                0x000000010e4a6699 event_base_loop + 1170 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.806 [warn] Bug:     7   tor                                 0x000000010d765696 do_main_loop + 2422 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.806 [warn] Bug:     8   tor                                 0x000000010d76e432 tor_main + 546 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.806 [warn] Bug:     9   tor                                 0x000000010d4236eb main + 27 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.806 [warn] Bug:     10  libdyld.dylib                       0x00007fff8edaf235 start + 1 (on Tor 0.3.2.0-alpha-dev 3092c8bb3e5eef94)
Sep 13 12:21:44.806 [info] pick_needed_intro_points: Unable to find a suitable node to be an introduction point for service ya3etbnz4ncqaexjurfbtozzp5puva3uzw2apbaatfvvpsvyzq7iikid.