[PATCH 3 of 5] lfs: fix the inferred remote store path when using a --prefix

[Yuya Nishihara]

On Fri, 13 Apr 2018 18:04:35 -0400, Matt Harbison wrote:
> # HG changeset patch
> # User Matt Harbison <matt_harbison at yahoo.com>
> # Date 1523643390 14400
> #      Fri Apr 13 14:16:30 2018 -0400
> # Node ID a4c12789ef4bac6e736681ef8a08ccbe71fb5c41
> # Parent  54c1ab20ed7fbf415d087e6e94ca273d172046e8
> lfs: fix the inferred remote store path when using a --prefix

The series looks good to me, except for the test failure.