teamd: allow to specify subpath in struct teamd_state_val_group

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
teamd: state: introduce functions for bulk register/unregister

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
teamd: ab: convert to new style state api

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
teamd: lacp: convert to new style state api

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
teamd: kill unused ->state_ops

Signed-off-by: Jiri Pirko <jiri@resnulli.us>