…oa/freeze_rooms

* 'dinsic' of github.com:matrix-org/synapse-dinsic:
  Only assert valid next_link params when provided (#65)
  Don't push if an user account has expired (#58)
  Swap method calls in RoomAccessTestCase.test_change_rules (#64)
  Make all rooms noisy by default (#60)
  Make AccessRules use the public rooms directory instead of checking a room's join rules on rule change (#63)
  Override the power levels defaults, enforce mod requirement for invites, admin requirements for unknown state events (#61)
  RoomAccessRules cleanup (#62)
  Add a config option for validating 'next_link' parameters against a domain whitelist (#8275)