[Updated] D8906: templater: restructure open_template() a little to prepare for relative paths

[indygreg (Gregory Szorc)]

This revision is now accepted and ready to land.
indygreg accepted this revision.

REPOSITORY
  rHG Mercurial

BRANCH
  default

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D8906/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D8906

To: martinvonz, #hg-reviewers, indygreg
Cc: mercurial-patches
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