D3120: tests: add test for `hg children -r <revset>`

[martinvonz (Martin von Zweigbergk)]

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  Folded into https://phab.mercurial-scm.org/D3085

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3120

To: martinvonz, #hg-reviewers, pulkit, indygreg
Cc: pulkit, mercurial-devel