logexchange: use the proper accessors to get the remote url There is an official method, let us use it. this will prevent a crash when the private attribute disappear.

peer: get the `path` object down to the httppeer One more peer with a path stored.

path: fix `url.copy` dropping the port The copy method have been wrong for a while, but the new code reveals it.

peer: pass the `path` object to `make_peer` We don't do anything with it yet, but we can start implementing it for each peer type starting now.

path: allow to copy a path while adjusting the url This will be used by `scheme` in the next changesets.

peer: store the path object used to build a peer from a repo This is the simplest case, we so starts with it.

peer: build a `path` object on the fly when needed So now, we always have a `path` object around when building the peer

peer: have `repo.peer` take an optional `path` argument We are ready to start to actually set the value now.

peer: add a `path` attribute to peer It will start being set in the coming changesets.

peer: have a common constructor and use it For now it does not do much, but we will extend it to also store a path object soon.