Merge branch 'net-Add-support-for-dumping-addresses-for-a-specific-device'

David Ahern says:

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net: Add support for dumping addresses for a specific device

Use the recently added kernel side filter infrastructure to add support
for dumping addresses only for a specific device.

Patch 1 creates an IPv4 version similar to IPv6's in6_dump_addrs function.

Patch 2 simplifies in6_dump_addrs by moving index tracking of IP
addresses from inet6_dump_addr to in6_dump_addrs.

Patches 3 and 4 use the device-based address dump helpers to limit a
dump to just the addresses on a specific device.
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Signed-off-by: David S. Miller <davem@davemloft.net>