wireproto: sort response to listkeys

The listkeys protocol is defined to produce a dictionary.
pushkey.decodekeys() uses a plain dict to hold the decoded results
of the wire protocol response. So order should not matter.

Upcoming tests will verify low-level output of wire protocol
commands and the non-deterministic emitting of listkeys was causing
intermittent failures.

So we make the output of listkeys deterministic.

Differential Revision: https://phab.mercurial-scm.org/D2405

mercurial/wireproto.py

@@ -916,7 +916,7 b' def hello(repo, proto):'
 
 @wireprotocommand('listkeys', 'namespace')
 def listkeys(repo, proto, namespace):
-    d = repo.listkeys(encoding.tolocal(namespace)).items()
+    d = sorted(repo.listkeys(encoding.tolocal(namespace)).items())
     return bytesresponse(pushkeymod.encodekeys(d))
 
 @wireprotocommand('lookup', 'key')