Need environment variable for qp timeout like NCCL_IB_TIMEOUT. In nvshmem, now it's hardcode. ``` DEVX_SET(qpc, qpc, retry_count, 7); DEVX_SET(qpc, qpc, rnr_retry, 7); DEVX_SET(qpc, qpc, primary_address_path.ack_timeout, 20); ```