netipmid: Update netipmid to use ipmid as the main queue

All ipmi processing is now done in the main ipmi queue
(phosphor-host-ipmid) and messages are passed via dbus. This removes the
handler registration for providers and just passes the message along to
the main queue instead of executing the provider in-situ. This makes the
net-ipmid more like the bt-bridge or kcs-bridge that are simple channel
handlers that move messages from a medium to the queue.

Change-Id: Icc9d580fd5546505c95acf0bea47c70e09809b7d
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
7 files changed