cubicweb-vcsfile #4294388 Support parsing og hg versions like 3.1-rc+foo [validation pending]

prioritynormal
typebug
done in1.17.0
load0.250
load left0.000
closed by#76ee6fdc09fc [test] fix hg version crash on 3.1-rc+foo (closes #4294388)
patch[test] fix hg version crash on 3.1-rc+foo [applied]