Skip LFS files in UberFilesizeTestEngine. (#54)
Skip LFS files in UberFilesizeTestEngine. (#54)

If "skip_lfs_files" config is true for UberFilesizeTestEngine, then
it checks if the files exceeding the given filesize limit are tracked by
LFS. Large modified files that are tracked by LFS are ignored in this
unit test, as they will already get uploaded to LFS server.
chundongwang/arcanist,uber/arcanist,uber/arcanist,chundongwang/arcanist,chundongwang/arcanist,uber/arcanist,uber/arcanist,chundongwang/arcanist