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
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