wireproto: properly call clonebundles command
We should not be using _call() to make wire protocol calls because
it isn't part of the peer API.
But clonebundles wasn't part of the supported commands in the
peer API!
So this commit defines that command in the commands interface,
implements it, and teaches the one caller in core to call it using
the command executor interface.
Differential Revision: https://phab.mercurial-scm.org/D3317
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