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NIXL uses UCX which will have support for EFA since 1.19. Explicitly
use the 1.19 branch for UCX with Dynamo.
Signed-off-by: Adit Ranadive <aranadive@nvidia.com>

vllm and sglang are now the sub-process engines from #954

Also updated docs on doing vllm and sglang multi-gpu (tensor parallel) and multi-node (pipeline parallel).

This reverts commit b5f3fe10.

Signed-off-by: Hongkuan Zhou <tedzhouhk@gmail.com>
Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>

Co-authored-by: Ubuntu <ubuntu@crusoe-prod--inst-2secxwyxeao1mi2dsqk2pl9oaz7.eu-iceland1-a.comp>
Co-authored-by: Hannah Zhang <hannahz@nvidia.com>
Co-authored-by: hongkuanz <hongkuanz@nvidia.com>

Signed-off-by: Pavithra Vijayakrishnan <160681768+pvijayakrish@users.noreply.github.com>

Also upgrade the cargo resolver to v3, the default.

New clippy lints:
- `next_back()` instead of `last()` for a double-ended iterator. That avoids walking the whole list.
- ` repeat_n` instead of `repeat.take`. That avoids cloning.
- Doc indenting

Co-authored-by: Ryan Olson <ryanolson@users.noreply.github.com>

Co-authored-by: Meenakshi Sharma <163925564+nvda-mesharma@users.noreply.github.com>

Co-authored-by: Meenakshi Sharma <163925564+nvda-mesharma@users.noreply.github.com>

Co-authored-by: Anant Sharma <anants@nvidia.com>