Adds new 'copyAllScoresOnMergeFirstParentUpdate' vote policy. This
policy allows to carry over votes on "merge commit rebase". This meas
when only first (left parent) changes and rest of parent(s) stays the
same.
Such policy is useful for changes that are merge commit of feature
branches that tracks destination branch. When it is enabled it reduces
the overhead of CI and human reviews on merge commits that only
incorporate newer changes from destination branch in next patch set.
Change-Id: I02062544608546498d9605c628bc1b7a0386e91a
Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
cedbbee78e