tersestatus: sort the dictionary before iterating on it

There has report of flakiness in test-status-terse.t. In the terse code, we are
iterating on a dictionary without sorting and since python dicts are unordered,
that can be a reason behind the flakiness. Before we have a better
implementation for the terse thing, let's make sure current implementation
possess minimum bugs.

Differential Revision: https://phab.mercurial-scm.org/D740

mercurial/cmdutil.py

@@ -536,7 +536,7 b' def tersestatus(root, statlist, status, '
 
         rs = []
         newls = []
-        for par, files in pardict.iteritems():
+        for par, files in sorted(pardict.iteritems()):
             lenpar = numfiles(par)
             if lenpar == len(files):
                 newls.append(par)