graft: add test for reading old graftstate files with new mechanism This tests the reading of old graftstate file using the new logic. The tests shows that if user is in middle of a graft and then updates their mercurial to the version where we have new graftstate format, we can still read the old graft state format files correctly. Differential Revision: https://phab.mercurial-scm.org/D2597

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{

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    "conduit_uri": "https://phab.mercurial-scm.org/api",

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    "repository.callsign": "HG",

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    "arc.land.onto.default": "@",

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    "base": "hg:.^"

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}