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A multi node with a single value is a plain string in the JSON rendering
of the config tree, and only becomes a list once it holds several values.
leaf_node_changed() tested for a string before diffing the lists, so
appending a value reported the already configured one as gone.
Adding a second bond member thus produced an "interface_remove" entry for
the first, and BondIf.update() released it right after enslaving the new
one, leaving the bond with the new member only.
Normalize to a list and reuse list_diff(). Only the string to list append
changes, from [old] to []. interface.py was immune as it re-applies
list_diff() to address_old, protocols_static_arp.py was not.
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