remotefilelog: use the right expandpath in to expand `~`
Given the context where path is most likely a file system path, I suspect that
the initial author confused ui.expandpath and util.expandpath (a proxy for
os.path.expanduser and co)
Differential Revision: https://phab.mercurial-scm.org/D10411
transplant: use `get_unique_pull_path`
The command does not support multiple destination (yet).
Differential Revision: https://phab.mercurial-scm.org/D10410