handle multi-root dag in DescendantsFlow #41
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currently
DescendantsFlowwill wait indefinitely if any of the descendants nodes has a parent that's not in path from start node to itself as the walk function never reaches there. This will be always true when dag has multiple roots and one of them being a start node.to fix that, this pr changes the size of
inputChannelsfrom all parents to only parents who are descendant of start node