Add AF_BRIDGE support to neigh cache
Add AF_BRIDGE support to neigh cache

This patch adds AF_BRIDGE to the list of families
supported by the cache. Implements oo_id_attrs_get to
declare separate id attributes for AF_UNSPEC and AF_BRIDGE
neigh objects

Signed-off-by: Roopa Prabhu <d3f6ba90004ada8c36186a20548ed980b7e493d1@cumulusnetworks.com>
Reviewed-by: Nolan Leake <2b78f1a11b050030c931d98cf25a8c2d3b85b913@cumulusnetworks.com>
Reviewed-by: Shrijeet Mukherjee <62b2e2e3d24633e33bb2cfda21ff188924e9f61e@cumulusnetworks.com>
Reviewed-by: Wilson Kok <9937d6c4e279711f30d620c8f4a144fb654ea717@cumulusnetworks.com>
Signed-off-by: Thomas Graf <17c2d8920621522552b392f72d8fdb4d1e866b44@suug.ch>

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