exchange: properly wrap wireprotocol capabilities
Just wrapping the module function only works for ssh. Ssh gets capability
through the `hello` command. We also need to wrap the function stored in the
command dict. This fix discovery for http peer.
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Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
Logilab SA <contact@logilab.fr>
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Patrick Mezard <patrick@mezard.eu>
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