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This reverts commit 19fb0c4e

.

Conflicts:

	NetlinkManager.cpp

Brings back Stan Chesnutt's change related to adding NETLINK_ROUTE
socket creation and event propagation.

Change-Id: I8c0625a95b7996ef75b883ce764c3244dd553a47
Signed-off-by: Mike J. Chen <mjchen@google.com>