D6735: update: added support for --abort flag(issue4404)

[taapas1128 (Taapas Agrawal)]

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  @durin42 I don't think the subrepos are properly initialized in the tests. I would be updating them soon.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D6735/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D6735

To: taapas1128, #hg-reviewers, durin42
Cc: durin42, mharbison72, pulkit, mjpieters, mercurial-devel