lfs: rename {oid} to {lfsoid}
Per Yuya, for consistency with {lfspointer}. It might be slightly confusing for
there to be {lfsoid} and {lfspointer.oid}. But preventing ambiguity seems more
important, and the latter is controlled by the git-lfs spec.
$ hg init
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ ls
a
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ hg co 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
B should disappear
$ ls
a