sif: LSO, test/adjust attr in create_qp,test stencil-size in send

sif: LSO, test/adjust attr in create_qp,test stencil-size in send

We need to test that we can add an sge for the LSO stencil
subtracting 1 from max number of supported sge.  The
attr.max_sge is incremented to get correct allocation of sge
with the extra entry for the LSO stencil.

We assumpe that the size of LSO headers/stencils is <= 64
adjusting max_inlinesize. The actual size is tested when
work-requests are posted.

Signed-off-by: Hans Westgaard Ry <hans.westgaard.ry@oracle.com>
Reviewed-by: Knut Omang <knut.omang@oracle.com>