Add logic to netdev_findbyaddr() to return the correct network device for the case where a broadcast address is used.  This change caused trivial ripples through other files because additional parameters are required for netdev_findbyaddr() when CONFIG_NET_MULTINIC

Network routing:  Refuse to perform routing table lookups for the Broadcast IP address.  From Brennan Ashton

Extensions to ECP conneciton structure for the case of multiple networks.  See additional comments regarding the similar change for UDP

Network:  Add logic to get a default network device (for the case where are multiple devices).  For INADDR_ANY

apps/examples/bridge:  Lots of fixes.  I think it is working although I have still have host firewall issues in testing

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@haltian.com>