cubicweb-vcreview #2924071 test compatibility with hg 2.6 [validation pending]

export format changed slightly

prioritynormal
typetask
done in1.2.0
load left0.000
closed by#1ade3dea3fe4 test: handle mercurial 2.6 (closes #2924071)
patchtest: handle mercurial 2.6 [applied]