repository: remove ipeercommands from ipeerbase
AFAICT all callers in core have moved to the commandexecutor
interface for invoking wire protocol commands. Or at least they
aren't using the named methods on ipeercommands to invoke them.
This means we can drop ipeercommands from the ipeerbase interface.
As far as interface based programming goes, it is now illegal to call
an ipeercommands method for issuing wire protocol commands. However,
the methods are still there, so they will still work. At some
point we will want to break that API...
Differential Revision: https://phab.mercurial-scm.org/D3318
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