Set RDMA QP 'retry_count' & 'rnr_retry_count' = 3
We don't use =7 (infinite) since we might hang forever instead of
falling to the re-connect logic

Change-Id: I91909adc103e6f7f7a84057b4ffe94020f895393
Signed-off-by: Alex Rosenbaum <Alexr@mellanox.com>