D1568: lfs: using workers in lfs prefetch

[wlis (Wojciech Lis)]

wlis requested review of this revision.
wlis added a comment.


  Tested with the server:
  
  [wlis at dev9680.prn1 ~/hg-committed/tests] ./run-tests.py -l test-lfs*
  
    ....
    # Ran 4 tests, 0 skipped, 0 failed.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D1568

To: wlis, #hg-reviewers, quark
Cc: mharbison72, quark, mercurial-devel