D1564: worker: make windows workers daemons

[durin42 (Augie Fackler)]

durin42 accepted this revision.
durin42 added a comment.
This revision is now accepted and ready to land.


  This looks good to me, but I managed to confirm that it does depend on https://phab.mercurial-scm.org/D1460 by looking at patch metadata via `hg phabread`, so I've added the necessary annotation.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D1564

To: wlis, #hg-reviewers, ikostia, durin42
Cc: durin42, durham, ikostia, mercurial-devel