D351: demandimport: disable by default if chg is being used

[sid0 (Siddharth Agarwal)]

sid0 added a comment.


  > I tried that approach. If we only set HGDEMANDIMPORT for the forked process to execute hg server, it will be an infinite loop - environment config hash will mismatch. Setting HGDEMANDIMPORT for both the forked and non-forked chg client processes seems less cleaner.
  
  This should be a comment in this patch :)

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D351

To: quark, #hg-reviewers
Cc: sid0, yuja, mercurial-devel