…ase-v1.8.x

* origin/release-v1.8.0: (27 commits)
  Test for outliers whose auth events are in a different room
  Test for receiving events with auth events in the wrong room
  enable frozen dicts in synapse (#778)
  Fix c&p error in #779
  Add support for synapse multi DB setups. (#775)
  Add console feedbak for the TAP output mode (#779)
  workaround for matrix-org/synapse#6536 (#772)
  Test for backfilled events whose prev_events cross room boundaries (#769)
  Add dendrite's logs to buildkite's artifacts (#773)
  Make the replication torture level adjustable (#771)
  Add test for removing redactions from search results (#747)
  Sanity-checking of some params (#765)
  Fix some 'undefined value' warnings (#768)
  Remove redundant fallback in on_request_federation_v1_event (#766)
  Deflake an AS test (#764)
  Add tests for outbound v2 invite API
  Fix diagnostics from logout test (#763)
  Add comment to explain what the v1 outbound test relies on
  Re-fix test names
  Fix test names
  ...