dirstate-v2: Remove the `.d` suffix in data file names It could cause confusion since `.d` is already used for revlogs. This suffix is not necessary since there is already a `dirstate.` prefix. Differential Revision: https://phab.mercurial-scm.org/D11413

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