RDMA/iwcm: Use a default listen backlog if needed

RDMA/iwcm: Use a default listen backlog if needed

commit 2f0304d21867476394cd51a54e97f7273d112261 upstream.

If the user creates a listening cm_id with backlog of 0 the IWCM ends
up not allowing any connection requests at all.  The correct behavior
is for the IWCM to pick a default value if the user backlog parameter
is zero.

Lustre from version 1.8.8 onward uses a backlog of 0, which breaks
iwarp support without this fix.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
[bwh: Backported to 3.2: use register_net_sysctl_table()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>