Fixes for dp + ep + tp combinations

[varun-sundar-rabindranath]

vllm server command :
vllm serve ${model}
--enforce-eager
--trust-remote-code
--tensor-parallel-size ${tp_size}
--data-parallel-size ${dp_size}
${EP_ARGS}
--no-enable-prefix-caching
--port ${server_port}

lm_eval command :
lm_eval --model local-completions
--tasks gsm8k
--model_args model=deepseek-ai/DeepSeek-V2-Lite,base_url=http://127.0.0.1:${SERVER_PORT}/v1/completions,num_concurrent=5,max_retries=3,tokenized_requests=False
--limit 100

verified correctness using lm-eval for the following combinations:

• DP=1 TP=1 EP=False
• DP=1 TP=2 EP=False
• DP=2 TP=1 EP=False
• DP=2 TP=2 EP=False
• DP=2 TP=1 EP=True
• DP=2 TP=2 EP=True ## Works only with VLLM_MLA_DISABLE=1

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[varun-sundar-rabindranath]

move tp / dp / ep computation here and out of FusedMoe .

[varun-sundar-rabindranath]

reduce_results must be True when using pplx dispatch combine.

[varun-sundar-rabindranath]

cosmetics - rearrange args

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