logging: allow a client to register a callback handler to recieve log messages
that way the client can maintain a correctly sequenced log
populate: fix the creation of interface and the setting of the handle
stats: the reset promise idea is not defined behaviour.
Use an eanble/disable command pair
Change-Id: I347720bb65df2874c7619e722d593bc863ee2bf1
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>