Merge branch 'netconf-delnetconf'

David Ahern says:

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netconf: Add support for RTM_DELNETCONF

netconf notifications are sent as devices register but not when they
are deleted leaving userspace caches out of sync. Add support for
RTM_DELNETCONF to ipv4, ipv6 and mpls.

MPLS is missing RTM_NEWNETCONF as devices are created, so add it as well.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>