Libnetwork passes a map[string]any to the bridge driver's Register
function. This forces the daemon to convert its configuration into a
map, and the driver to convert that map back into a struct.
This is unnecessary complexity, and makes it harder to track down where
and how bridge driver configuration fields are set.
Refactor libnetwork to let the daemon register the bridge.Configuration
directly through a new option `OptionBridgeConfig`.
The bridge driver now takes a `Configuration` param that needs no
special treatment.
Signed-off-by: Albin Kerouanton <albinker@gmail.com>
