errors: raise RemoteError in some places in exchange.py
This is part of https://www.mercurial-scm.org/wiki/ErrorCategoriesPlan
Differential Revision: https://phab.mercurial-scm.org/D10467
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}