Returns neighbor configuration for given neighbor ip address.

    Raises exception if no neighbor with `neigh_ip_address` exists.

def _get_neighbor_conf(neigh_ip_address):
    """Returns neighbor configuration for given neighbor ip address.

    Raises exception if no neighbor with `neigh_ip_address` exists.
    """
    neigh_conf = \
        CORE_MANAGER.neighbors_conf.get_neighbor_conf(neigh_ip_address)
    if not neigh_conf:
        raise RuntimeConfigError(desc='No Neighbor configuration with IP'
                                 ' address %s' % neigh_ip_address)
    assert isinstance(neigh_conf, NeighborConf)
    return neigh_conf