nvme-fabrics: Add host_traddr options field to host infrastructure

Add the host_traddr field to allow specification of the host-port
connection info for the transport. Will be used by FC transport.

Signed-off-by: James Smart <james.smart@broadcom.com>
Acked-by: Johannes Thumshirn <jth@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>