The order to apply qos.json and buffers.json cannot be reversed

[stcheng]

Currently there are internal dependencies in between qos.json and buffers.json files that if the order of applying the configurations cannot be guaranteed, some configurations cannot be applied correctly.

After brief debugging on this issue, it is possible that there might be some internal dependencies in bcmsai package.

[stcheng]

#439 is a temporary fix and cannot guarantee to success.

[stcheng]

@pavel-shirshov could you check if this is no longer an issue after the Broadcom SDK update.

[stcheng]

no longer an issue.