util: T2241: add get_bridge_member_config function

Function that parses the config of a bridge member into a dict that is
needed to apply all port config when adding a port to a bridge.
Needed because other interfaces will be adding themselves to the bridge
outside of the bridge conf_mode script and they need a common place to
get their config.
Can't be put as method of BridgeIf as we can't invoke it without it
creating the bridge (create=False raises an exception), we need to
get the configuration before we create the interface.

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