ssa.c: Fill in ssa_db 'data_tbl_cnt' field on downstream

Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>
Signed-off-by: Hal Rosenstock <hal@mellanox.com>
ssa.c: Updated ssa_log message to show number of tables received on downstream

Signed-off-by: Hal Rosenstock <hal@mellanox.com>