deps(conda): use transformers-env with vllm,exllama(2) (#1554)

* deps(conda): use transformers with vllm

* join vllm, exllama, exllama2, split petals

backend/python/vllm/test.sh

@@ -3,7 +3,7 @@
 ## A bash script wrapper that runs the transformers server with conda
 
 # Activate conda environment
-source activate vllm
+source activate transformers
 
 # get the directory where the bash script is located
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"