test fail: assert(ip->time_to_expire OP_GE now + INTRO_POINT_LIFETIME_MIN_SECONDS

weasel reported a test failing for debian: https://buildd.debian.org/status/fetch.php?pkg=tor&arch=mipsel&ver=0.4.2.1-alpha-1&stamp=1569200155&raw=0

hs_service/service_intro_point: [forking] 
  FAIL ../src/test/test_hs_service.c:694: assert(ip->time_to_expire OP_GE now + INTRO_POINT_LIFETIME_MIN_SECONDS - 500): 1569262226 vs 1569262632
  [service_intro_point FAILED]

this seems to have occured before in #25450 (moved) and #27810 (moved) and it's still unfixed :/

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