.arcconfig

py3: add Python 3 exception output to test-lfs-serve-access.t

Similar to a973a75e92bf or 3e9c6cef949b.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}