(tools) add Broadcom (bnxt) support to env_check.sh and env_setup.sh

[QizhouZhang97]

(tools) add bnxt env check

[QizhouZhang97]

Summary

Add Broadcom NetXtreme-E (bnxt / Thor2) support to mori check and mori setup, previously ionic-only.

env_check.sh

• Auto-detect bnxt vs ionic via PCI vendor ID; run vendor-specific checks for firmware, driver, userspace lib, QoS/PFC, and DCQCN
• Replace hardcoded GID index (-x 1, link-local, not routable through ToR) with automatic best-GID picker mirroring MORI's ScoreGidCandidate — prefers RoCEv2, IPv4-mapped over link-local
• Rewrite intra/inter-node mesh as parallel mesh_execute runner with configurable concurrency, per-pair timeouts, and retry logic
• Add SSH connection multiplexing (ControlMaster) for inter-node tests
• Add intra_reachable() to skip cross-subnet pairs that can't hairpin through the ToR

env_setup.sh

• Add bnxt_setup_pfc (via dcb), bnxt_setup_dcqcn (via configfs), bnxt_mori_env_setup parallel to existing ionic functions
• CNP service profile detection for 2-TC vs 3-TC layout
• Extract shared QoS constants (ROCE_PRIO, ROCE_DSCP, ROCE_BW) used by both vendors

deploy-mori skill

• Add MPI deps to base install; remove unsupported ConnectX references

Test plan

• mori check / mori setup on bnxt node
• mori check <peer_ip> inter-node on bnxt
• Regression check on ionic node