identify: change {parents} to a list of nodes (BC)
This is a part of the name unification. {parents} is a list of nodes in
"hg log -Tjson" output. Since {rev} can be computed from (repo, node) pair,
we no longer need to put it to provide {rev} to user templates.
https://www.mercurial-scm.org/wiki/GenericTemplatingPlan#Dictionary
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