Change the ifupdown dispatcher script and set ADDRFAM to "inet" or "inet6"

depending on whether the connection has a valid IPv4 or IPv6 address.
Using "NetworkManager" as ADDRFAM type did confuse most ifupdown hook
scripts and e.g. broke async NFS mounts. (Closes: #475188, #656584)

Make sure to also remove "exec" when running run-parts, otherwise the
for loop would exit after the first iteration.

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