treemanifest: make `updatecaches` update the nodemaps for all directories
Without this, if the cache for a nested directory is in a bad state,
it's very hard to repair it.
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}