Since 2006 there has been no user of rdmacm based application to make use
of setting multiple path records using rdma_set_ib_paths API.

Therefore code is simplified to allow setting one path record entry.
Now that it sets only single path, it is renamed to reflect the same.
Signed-off-by: NParav Pandit <parav@mellanox.com>
Reviewed-by: NMark Bloch <markb@mellanox.com>
Signed-off-by: NLeon Romanovsky <leon@kernel.org>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>