cmdutil: sort unresolved paths
I noticed that `hg status` was printing unresolved paths in a
non-deterministic order. This patch fixes that.
I'm not sure if the sorting should be done in
merge.mergestate.unresolved() instead. Either way fixes the
presentation issue.
Differential Revision: https://phab.mercurial-scm.org/D4929
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}