Network Event Notifier Mechanism

Dave/Roland, is this patchset about ready to go?

Round 5 Changes:

- removed user-mode support
- removed route add/del events.

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This patch implements a mechanism that allows interested clients to
register for notification of certain network events. The intended use
is to allow RDMA devices (linux/drivers/infiniband) to be notified of
neighbour updates, ICMP redirects, and path MTU changes.

RDMA devices need these network events because they typically
cache this information in hardware and need to be notified
when it changes.  To learn about RDMA internet protocols, see:
http://www.ietf.org/html.charters/rddp-charter.html.

The key events of interest are:

- neighbour mac address change 
- routing redirect (the next hop neighbour changes for a dst_entry)
- path mtu change (the path mtu for a dst_entry changes).

This patchset consists of 3 patches:

1) New files implementing the Network Event Notifier
2) Core network changes to generate netevents
3) Cleanup ib_addr modules to use the netevent patch

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
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