repository: implement generic capability methods on peer class...
repository: implement generic capability methods on peer class
These methods are part of the peer interface, are generic, and can
be implemented in terms of other members of the peer interface. So we
implement them on the peer base class as a convenience.
The implementation is essentially copied from peer.py. The code
in peer.py will eventually be deleted.
Differential Revision:
https://phab.mercurial-scm.org/D334
